llm-proxy(app): gemma 反向代理 + token 鉴权 + /chat web UI

新 service，ns `llm-proxy`，域 `llm.famzheng.me`。
- POST /v1/chat/completions — OpenAI 兼容透传到 mochi 同款 backend
  gateway (gemma-4-31b-it)；一期强制 stream=false，SSE 留二期
- 鉴权: `Authorization: token <PROXY_AUTH_TOKEN>` 或同款 Bearer；
  常时间比较防 timing；空 expected 一律拒
- GET /chat — 自带极简 HTML chat UI（token 走 localStorage，
  附 curl example details）；/ 跳转到 /chat
- Secrets `llm-proxy/proxy-credentials` 已 kubectl 手工创建：
  BACKEND_TOKEN (上游) + PROXY_AUTH_TOKEN (对外)
- 13 个 cargo test 覆盖 auth 多个 scheme / 边界 + body
  改写 (stream=false 强制注入)

.gitea/workflows/deploy-llm-proxy.yml

@@ -0,0 +1,52 @@
+name: deploy llm-proxy
+# llm.famzheng.me — gemma 反向代理。host shell runner（fam 用户）。
+
+on:
+  push:
+    branches: [master]
+    paths:
+      - 'apps/llm-proxy/**'
+      - 'crates/cube-core/**'
+      - 'Cargo.toml'
+      - 'Cargo.lock'
+      - '.gitea/workflows/deploy-llm-proxy.yml'
+  workflow_dispatch:
+
+jobs:
+  build-and-deploy:
+    runs-on: ubuntu-latest
+    env:
+      APP: llm-proxy
+      IMAGE: registry.famzheng.me/mochi/llm-proxy
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Resolve image tag
+        id: tag
+        run: echo "sha=$(git rev-parse --short=12 HEAD)" >> "$GITHUB_OUTPUT"
+
+      - name: Build rust (musl static)
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          cargo build --release --target x86_64-unknown-linux-musl -p "$APP"
+
+      - name: Run tests
+        run: |
+          export PATH="$HOME/.cargo/bin:$PATH"
+          cargo test --release -p "$APP"
+
+      - name: Build & push image
+        env:
+          REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
+        run: |
+          echo "$REGISTRY_TOKEN" | docker login registry.famzheng.me -u mochi --password-stdin
+          docker build --no-cache -f "apps/$APP/Dockerfile" -t "$IMAGE:${{ steps.tag.outputs.sha }}" .
+          docker push "$IMAGE:${{ steps.tag.outputs.sha }}"
+
+      - name: Initialize K8s resources
+        run: kubectl apply -f "apps/$APP/k8s/all.yaml"
+
+      - name: Roll out to k3s
+        run: |
+          kubectl -n llm-proxy set image "deploy/$APP" "$APP=$IMAGE:${{ steps.tag.outputs.sha }}"
+          kubectl -n llm-proxy rollout status "deploy/$APP" --timeout=120s

Cargo.lock

@@ -649,6 +649,20 @@ version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "92daf443525c4cce67b150400bc2316076100ce0b3686209eb8cf3c31612e6f0"
 
+[[package]]
+name = "llm-proxy"
+version = "0.1.0"
+dependencies = [
+ "axum",
+ "cube-core",
+ "reqwest",
+ "serde",
+ "serde_json",
+ "tokio",
+ "tower-http",
+ "tracing",
+]
+
 [[package]]
 name = "lock_api"
 version = "0.4.14"

Cargo.toml

@@ -9,6 +9,7 @@ members = [
     "apps/articulate",
     "apps/karaoke",
     "apps/notes",
+    "apps/llm-proxy",
 ]
 
 [workspace.package]

apps/llm-proxy/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "llm-proxy"
+version = "0.1.0"
+edition.workspace = true
+license.workspace = true
+authors.workspace = true
+description = "llm.famzheng.me — gemma-4-31b-it 反向代理 + token 鉴权 + /chat web UI"
+
+[dependencies]
+cube-core = { path = "../../crates/cube-core" }
+axum = { workspace = true }
+tokio = { workspace = true }
+tower-http = { workspace = true }
+tracing = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+reqwest = { workspace = true }

apps/llm-proxy/Dockerfile

@@ -0,0 +1,5 @@
+# llm-proxy — llm.famzheng.me
+FROM scratch
+COPY target/x86_64-unknown-linux-musl/release/llm-proxy /llm-proxy
+EXPOSE 8080
+ENTRYPOINT ["/llm-proxy"]

apps/llm-proxy/k8s/all.yaml

@@ -0,0 +1,90 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: llm-proxy
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: llm-proxy
+  namespace: llm-proxy
+  labels:
+    app: llm-proxy
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: llm-proxy
+  template:
+    metadata:
+      labels:
+        app: llm-proxy
+    spec:
+      imagePullSecrets:
+        - name: registry-creds
+      containers:
+        - name: llm-proxy
+          image: registry.famzheng.me/mochi/llm-proxy:latest
+          imagePullPolicy: IfNotPresent
+          ports:
+            - containerPort: 8080
+              name: http
+          envFrom:
+            # secret `proxy-credentials` 由 kubectl 手工创建（BACKEND_TOKEN +
+            # PROXY_AUTH_TOKEN），不在 git manifest 里。
+            - secretRef:
+                name: proxy-credentials
+          env:
+            - name: LLM_GATEWAY
+              value: "http://3.135.65.204:8848/v1"
+          readinessProbe:
+            httpGet:
+              path: /healthz
+              port: http
+            initialDelaySeconds: 1
+            periodSeconds: 5
+          livenessProbe:
+            httpGet:
+              path: /healthz
+              port: http
+            initialDelaySeconds: 5
+            periodSeconds: 15
+          resources:
+            requests:
+              cpu: 10m
+              memory: 16Mi
+            limits:
+              cpu: 200m
+              memory: 128Mi
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: llm-proxy
+  namespace: llm-proxy
+spec:
+  selector:
+    app: llm-proxy
+  ports:
+    - name: http
+      port: 80
+      targetPort: 8080
+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: llm-proxy
+  namespace: llm-proxy
+spec:
+  ingressClassName: traefik
+  rules:
+    - host: llm.famzheng.me
+      http:
+        paths:
+          - path: /
+            pathType: Prefix
+            backend:
+              service:
+                name: llm-proxy
+                port:
+                  number: 80

apps/llm-proxy/src/main.rs

@@ -0,0 +1,147 @@
+//! llm.famzheng.me — gemma-4-31b-it 反向代理 + 简单 token 鉴权。
+//!
+//! - `GET  /`                       → `/chat` 跳转
+//! - `GET  /chat`                   → 静态 web UI
+//! - `POST /v1/chat/completions`    → OpenAI 兼容透传 (要 Authorization: token <PROXY_AUTH_TOKEN>)
+//! - `GET  /healthz`                → 不带 auth, 给 k8s probe
+
+mod proxy;
+
+use std::sync::Arc;
+
+use axum::{
+    extract::State,
+    http::{header, StatusCode},
+    middleware::{self, Next},
+    response::{Html, IntoResponse, Redirect, Response},
+    routing::{get, post},
+    Router,
+};
+use tower_http::trace::TraceLayer;
+
+#[tokio::main]
+async fn main() -> std::io::Result<()> {
+    cube_core::init_tracing();
+    let cfg = Arc::new(proxy::Config::from_env());
+    let port: u16 = std::env::var("PORT")
+        .ok()
+        .and_then(|s| s.parse().ok())
+        .unwrap_or(8080);
+
+    let chat_api = Router::new()
+        .route("/v1/chat/completions", post(proxy::handle))
+        .route_layer(middleware::from_fn_with_state(cfg.clone(), require_token))
+        .with_state(cfg);
+
+    let app = Router::new()
+        .route("/healthz", get(|| async { "ok" }))
+        .route("/", get(|| async { Redirect::permanent("/chat") }))
+        .route("/chat", get(chat_ui))
+        .merge(chat_api)
+        .layer(TraceLayer::new_for_http());
+
+    let addr = format!("0.0.0.0:{port}");
+    let listener = tokio::net::TcpListener::bind(&addr).await?;
+    tracing::info!(%addr, "llm-proxy listening");
+    axum::serve(listener, app).await
+}
+
+const CHAT_HTML: &str = include_str!("../web/chat.html");
+
+async fn chat_ui() -> Html<&'static str> {
+    Html(CHAT_HTML)
+}
+
+/// 验 `Authorization: token <PROXY_AUTH_TOKEN>`，错的直接 401。
+async fn require_token(
+    State(cfg): State<Arc<proxy::Config>>,
+    req: axum::extract::Request,
+    next: Next,
+) -> Response {
+    let header_val = req
+        .headers()
+        .get(header::AUTHORIZATION)
+        .and_then(|v| v.to_str().ok())
+        .map(str::trim);
+
+    match header_val {
+        Some(v) if check_token(v, &cfg.proxy_auth_token) => next.run(req).await,
+        _ => (
+            StatusCode::UNAUTHORIZED,
+            "缺少或不匹配 `Authorization: token <your-token>`",
+        )
+            .into_response(),
+    }
+}
+
+/// 接受 `token <T>` 或 `Bearer <T>`（OpenAI client 习惯发 Bearer，宽容点）。
+pub fn check_token(header_value: &str, expected: &str) -> bool {
+    if expected.is_empty() {
+        return false;
+    }
+    let trimmed = header_value.trim();
+    if let Some(rest) = trimmed.strip_prefix("token ") {
+        return constant_time_eq(rest.trim().as_bytes(), expected.as_bytes());
+    }
+    if let Some(rest) = trimmed.strip_prefix("Bearer ") {
+        return constant_time_eq(rest.trim().as_bytes(), expected.as_bytes());
+    }
+    false
+}
+
+/// 常时间比较，防 timing attack（虽然这场景影响小，做了不亏）。
+fn constant_time_eq(a: &[u8], b: &[u8]) -> bool {
+    if a.len() != b.len() {
+        return false;
+    }
+    let mut diff: u8 = 0;
+    for (x, y) in a.iter().zip(b.iter()) {
+        diff |= x ^ y;
+    }
+    diff == 0
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn check_token_accepts_token_scheme() {
+        assert!(check_token("token famzheng-llm-2026", "famzheng-llm-2026"));
+    }
+
+    #[test]
+    fn check_token_accepts_bearer_scheme() {
+        assert!(check_token("Bearer famzheng-llm-2026", "famzheng-llm-2026"));
+    }
+
+    #[test]
+    fn check_token_rejects_wrong_value() {
+        assert!(!check_token("token wrong", "famzheng-llm-2026"));
+    }
+
+    #[test]
+    fn check_token_rejects_unknown_scheme() {
+        assert!(!check_token("Basic famzheng-llm-2026", "famzheng-llm-2026"));
+        assert!(!check_token("famzheng-llm-2026", "famzheng-llm-2026"));
+    }
+
+    #[test]
+    fn check_token_rejects_empty_expected() {
+        // 防 misconfigured：空 expected 不应该让任何人通过
+        assert!(!check_token("token any", ""));
+        assert!(!check_token("Bearer ", ""));
+    }
+
+    #[test]
+    fn check_token_strips_extra_whitespace() {
+        assert!(check_token("  token   famzheng-llm-2026  ", "famzheng-llm-2026"));
+    }
+
+    #[test]
+    fn check_token_rejects_prefix_match() {
+        // 防止"famzheng-llm-2026-extra" 通过
+        assert!(!check_token("token famzheng-llm-2026-extra", "famzheng-llm-2026"));
+        assert!(!check_token("token famzheng-llm", "famzheng-llm-2026"));
+    }
+}

apps/llm-proxy/src/proxy.rs

@@ -0,0 +1,173 @@
+//! `/v1/chat/completions` 透传 — 替换 Authorization 头，把请求 body 原样 forward 到
+//! 上游 LLM gateway，把响应 body 原样回吐给客户端。
+//!
+//! 一期只支持非 streaming（force `stream: false` 进 body），SSE 透传留给二期。
+
+use std::sync::Arc;
+
+use axum::{
+    body::Bytes,
+    extract::State,
+    http::{HeaderMap, HeaderValue, StatusCode},
+    response::{IntoResponse, Response},
+};
+use serde_json::Value;
+
+#[derive(Clone, Debug)]
+pub struct Config {
+    pub upstream_url: String, // http://3.135.65.204:8848/v1/chat/completions
+    pub upstream_token: String,
+    pub proxy_auth_token: String,
+}
+
+impl Config {
+    pub fn from_env() -> Self {
+        let gateway = std::env::var("LLM_GATEWAY")
+            .unwrap_or_else(|_| "http://3.135.65.204:8848/v1".to_string());
+        let upstream_url = format!("{}/chat/completions", gateway.trim_end_matches('/'));
+        Self {
+            upstream_url,
+            upstream_token: std::env::var("BACKEND_TOKEN").unwrap_or_default(),
+            proxy_auth_token: std::env::var("PROXY_AUTH_TOKEN").unwrap_or_default(),
+        }
+    }
+}
+
+pub async fn handle(State(cfg): State<Arc<Config>>, body: Bytes) -> Response {
+    // 1. parse body → 强制 stream=false（一期不支持流式）
+    let body_bytes = match force_non_stream(&body) {
+        Ok(b) => b,
+        Err(e) => {
+            return (StatusCode::BAD_REQUEST, format!("bad JSON body: {e}")).into_response();
+        }
+    };
+
+    // 2. forward
+    let client = reqwest::Client::new();
+    let res = client
+        .post(&cfg.upstream_url)
+        .header("Authorization", format!("Bearer {}", cfg.upstream_token))
+        .header("Content-Type", "application/json")
+        .body(body_bytes)
+        .send()
+        .await;
+
+    match res {
+        Ok(r) => relay_response(r).await,
+        Err(e) => {
+            tracing::error!(error=%e, "upstream call failed");
+            (StatusCode::BAD_GATEWAY, format!("upstream error: {e}")).into_response()
+        }
+    }
+}
+
+/// parse JSON、塞入 `stream: false`、重新 serialize。
+/// 如果不是 JSON object 就保持原样（让上游自己报错）。
+fn force_non_stream(body: &Bytes) -> Result<Vec<u8>, String> {
+    if body.is_empty() {
+        return Err("empty body".into());
+    }
+    let mut v: Value = serde_json::from_slice(body).map_err(|e| e.to_string())?;
+    if let Some(obj) = v.as_object_mut() {
+        obj.insert("stream".to_string(), Value::Bool(false));
+    }
+    serde_json::to_vec(&v).map_err(|e| e.to_string())
+}
+
+async fn relay_response(upstream: reqwest::Response) -> Response {
+    let status = upstream.status();
+    let ct = upstream
+        .headers()
+        .get(reqwest::header::CONTENT_TYPE)
+        .cloned()
+        .unwrap_or_else(|| HeaderValue::from_static("application/json"));
+    let bytes = match upstream.bytes().await {
+        Ok(b) => b,
+        Err(e) => {
+            tracing::error!(error=%e, "read upstream body");
+            return (StatusCode::BAD_GATEWAY, "read upstream body failed").into_response();
+        }
+    };
+    let mut headers = HeaderMap::new();
+    headers.insert(axum::http::header::CONTENT_TYPE, ct);
+    (
+        StatusCode::from_u16(status.as_u16()).unwrap_or(StatusCode::BAD_GATEWAY),
+        headers,
+        bytes,
+    )
+        .into_response()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn force_non_stream_overrides_stream_true() {
+        let input = Bytes::from(r#"{"model":"gemma","messages":[],"stream":true}"#);
+        let out = force_non_stream(&input).unwrap();
+        let v: Value = serde_json::from_slice(&out).unwrap();
+        assert_eq!(v["stream"], Value::Bool(false));
+    }
+
+    #[test]
+    fn force_non_stream_injects_when_absent() {
+        let input = Bytes::from(r#"{"model":"gemma","messages":[]}"#);
+        let out = force_non_stream(&input).unwrap();
+        let v: Value = serde_json::from_slice(&out).unwrap();
+        assert_eq!(v["stream"], Value::Bool(false));
+    }
+
+    #[test]
+    fn force_non_stream_preserves_other_fields() {
+        let input = Bytes::from(
+            r#"{"model":"gemma-4-31b-it","temperature":0.7,"messages":[{"role":"user","content":"hi"}]}"#,
+        );
+        let out = force_non_stream(&input).unwrap();
+        let v: Value = serde_json::from_slice(&out).unwrap();
+        assert_eq!(v["model"], "gemma-4-31b-it");
+        assert_eq!(v["temperature"], 0.7);
+        assert_eq!(v["messages"][0]["role"], "user");
+    }
+
+    #[test]
+    fn force_non_stream_rejects_empty() {
+        assert!(force_non_stream(&Bytes::new()).is_err());
+    }
+
+    #[test]
+    fn force_non_stream_rejects_invalid_json() {
+        let input = Bytes::from(r#"not json"#);
+        assert!(force_non_stream(&input).is_err());
+    }
+
+    #[test]
+    fn config_from_env_builds_completions_url() {
+        // Saved env keeps test isolation under cargo test (run in parallel)
+        let prev_gateway = std::env::var("LLM_GATEWAY").ok();
+        let prev_token = std::env::var("BACKEND_TOKEN").ok();
+        let prev_proxy = std::env::var("PROXY_AUTH_TOKEN").ok();
+        std::env::set_var("LLM_GATEWAY", "http://1.2.3.4:8848/v1/");
+        std::env::set_var("BACKEND_TOKEN", "backend-xxx");
+        std::env::set_var("PROXY_AUTH_TOKEN", "client-yyy");
+
+        let cfg = Config::from_env();
+        assert_eq!(cfg.upstream_url, "http://1.2.3.4:8848/v1/chat/completions");
+        assert_eq!(cfg.upstream_token, "backend-xxx");
+        assert_eq!(cfg.proxy_auth_token, "client-yyy");
+
+        // restore
+        match prev_gateway {
+            Some(v) => std::env::set_var("LLM_GATEWAY", v),
+            None => std::env::remove_var("LLM_GATEWAY"),
+        }
+        match prev_token {
+            Some(v) => std::env::set_var("BACKEND_TOKEN", v),
+            None => std::env::remove_var("BACKEND_TOKEN"),
+        }
+        match prev_proxy {
+            Some(v) => std::env::set_var("PROXY_AUTH_TOKEN", v),
+            None => std::env::remove_var("PROXY_AUTH_TOKEN"),
+        }
+    }
+}

apps/llm-proxy/web/chat.html

@@ -0,0 +1,174 @@
+<!doctype html>
+<html lang="zh-CN">
+<head>
+<meta charset="UTF-8" />
+<meta name="viewport" content="width=device-width, initial-scale=1" />
+<meta name="theme-color" content="#0f1419" />
+<title>llm.famzheng.me</title>
+<style>
+  :root {
+    color-scheme: dark;
+    --bg: #0f1419; --soft: rgba(255,255,255,.06); --border: rgba(255,255,255,.15);
+    --fg: rgba(255,255,255,.92); --dim: rgba(255,255,255,.55);
+    --accent: #7c3aed; --accent2: #06b6d4;
+  }
+  * { box-sizing: border-box; }
+  html, body { margin: 0; padding: 0; min-height: 100vh; background: var(--bg); color: var(--fg);
+    font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', system-ui, sans-serif; }
+  main { max-width: 760px; margin: 0 auto; padding: 16px; display: flex; flex-direction: column; min-height: 100vh; }
+  header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
+  h1 { font-size: 1.25rem; margin: 0; background: linear-gradient(135deg, #fff, var(--accent2));
+       -webkit-background-clip: text; background-clip: text; color: transparent; }
+  header small { color: var(--dim); font-size: 0.8rem; }
+  .config { display: flex; gap: 8px; margin-bottom: 12px; }
+  .config input, .config select {
+    flex: 1; padding: 8px 10px; background: var(--soft); border: 1px solid var(--border);
+    border-radius: 6px; color: var(--fg); font: inherit;
+  }
+  .thread { flex: 1; overflow-y: auto; padding: 8px 0; display: flex; flex-direction: column; gap: 10px;
+    border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); margin-bottom: 10px; }
+  .bubble { max-width: 85%; padding: 10px 13px; border-radius: 12px; white-space: pre-wrap;
+    word-wrap: break-word; line-height: 1.4; font-size: 0.92rem; }
+  .bubble.user { align-self: flex-end; background: linear-gradient(135deg, var(--accent), #4f46e5); color: white; }
+  .bubble.assistant { align-self: flex-start; background: var(--soft); border: 1px solid var(--border); }
+  .bubble.err { align-self: stretch; background: rgba(239,68,68,.15); border: 1px solid rgba(239,68,68,.4); color: #ff8080; }
+  .typing { display: inline-flex; gap: 4px; padding: 12px; }
+  .typing span { width: 6px; height: 6px; border-radius: 50%; background: var(--dim); animation: b 1.2s infinite; }
+  .typing span:nth-child(2) { animation-delay: 0.15s; }
+  .typing span:nth-child(3) { animation-delay: 0.3s; }
+  @keyframes b { 0%,60%,100% { transform: translateY(0); opacity: 0.45; } 30% { transform: translateY(-4px); opacity: 1; } }
+  footer { display: flex; gap: 8px; align-items: flex-end; }
+  textarea { flex: 1; resize: none; padding: 8px 10px; background: var(--soft); border: 1px solid var(--border);
+    border-radius: 8px; color: var(--fg); font: inherit; line-height: 1.4; }
+  textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
+  button.send { background: linear-gradient(135deg, var(--accent), var(--accent2));
+    color: white; border: none; padding: 10px 16px; border-radius: 8px; font-weight: 600; }
+  button.send:disabled { background: var(--soft); color: var(--dim); cursor: not-allowed; }
+  button.ghost { background: transparent; border: 1px solid var(--border); color: var(--fg);
+    padding: 6px 10px; border-radius: 6px; font-size: 0.85rem; }
+  details { margin-top: 12px; color: var(--dim); font-size: 0.85rem; }
+  details code { background: var(--soft); padding: 1px 5px; border-radius: 4px; font-size: 0.9em; color: var(--fg); }
+  details pre { background: rgba(0,0,0,.4); padding: 10px; border-radius: 8px; overflow-x: auto;
+    border: 1px solid var(--border); color: var(--fg); }
+</style>
+</head>
+<body>
+<main>
+  <header>
+    <h1>llm.famzheng.me</h1>
+    <small id="meta">gemma-4-31b-it · 反向代理</small>
+  </header>
+
+  <div class="config">
+    <input id="token" type="password" placeholder="Authorization token (e.g. famzheng-llm-2026)" />
+    <button class="ghost" id="reset">清空对话</button>
+  </div>
+
+  <div class="thread" id="thread"></div>
+
+  <footer>
+    <textarea id="input" rows="2" placeholder="说点什么...（Enter 发送，Shift+Enter 换行）"></textarea>
+    <button class="send" id="send">发送</button>
+  </footer>
+
+  <details>
+    <summary>curl example</summary>
+<pre>curl -X POST https://llm.famzheng.me/v1/chat/completions \
+  -H 'Authorization: token &lt;your-token&gt;' \
+  -H 'Content-Type: application/json' \
+  -d '{
+    "model": "gemma-4-31b-it",
+    "messages": [{"role":"user","content":"hello"}]
+  }'</pre>
+  </details>
+</main>
+
+<script>
+  const TOKEN_KEY = 'llm-proxy-token'
+  const tokenInput = document.getElementById('token')
+  const sendBtn = document.getElementById('send')
+  const resetBtn = document.getElementById('reset')
+  const input = document.getElementById('input')
+  const thread = document.getElementById('thread')
+
+  tokenInput.value = localStorage.getItem(TOKEN_KEY) || ''
+  tokenInput.addEventListener('change', () => {
+    localStorage.setItem(TOKEN_KEY, tokenInput.value.trim())
+  })
+
+  const history = []
+
+  function bubble(role, text, cls) {
+    const div = document.createElement('div')
+    div.className = 'bubble ' + (cls || role)
+    div.textContent = text
+    thread.appendChild(div)
+    thread.scrollTop = thread.scrollHeight
+    return div
+  }
+
+  function typing() {
+    const div = document.createElement('div')
+    div.className = 'bubble assistant typing'
+    div.innerHTML = '<span></span><span></span><span></span>'
+    thread.appendChild(div)
+    thread.scrollTop = thread.scrollHeight
+    return div
+  }
+
+  async function send() {
+    const text = input.value.trim()
+    const token = tokenInput.value.trim()
+    if (!text) return
+    if (!token) { bubble('err', '先在上方填 token。', 'err'); return }
+    input.value = ''
+    history.push({ role: 'user', content: text })
+    bubble('user', text)
+    sendBtn.disabled = true
+    const dot = typing()
+    try {
+      const res = await fetch('/v1/chat/completions', {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+          'Authorization': 'token ' + token,
+        },
+        body: JSON.stringify({
+          model: 'gemma-4-31b-it',
+          messages: history,
+        }),
+      })
+      const body = await res.text()
+      dot.remove()
+      if (!res.ok) {
+        bubble('err', `${res.status}: ${body}`, 'err')
+        history.pop()
+        return
+      }
+      let data
+      try { data = JSON.parse(body) } catch (e) {
+        bubble('err', '上游返回非 JSON: ' + body.slice(0, 300), 'err'); history.pop(); return
+      }
+      const reply = data?.choices?.[0]?.message?.content?.trim() || '(空回复)'
+      history.push({ role: 'assistant', content: reply })
+      bubble('assistant', reply)
+    } catch (e) {
+      dot.remove()
+      bubble('err', '网络错误: ' + e.message, 'err')
+      history.pop()
+    } finally {
+      sendBtn.disabled = false
+    }
+  }
+
+  sendBtn.addEventListener('click', send)
+  input.addEventListener('keydown', (e) => {
+    if (e.key === 'Enter' && !e.shiftKey) { e.preventDefault(); send() }
+  })
+  resetBtn.addEventListener('click', () => {
+    history.length = 0
+    thread.innerHTML = ''
+  })
+</script>
+</body>
+</html>