notes(asr): 切片串行 ASR 绕单文件大小限制

ASR server 直接 500 拒绝大文件 (15MB / ~15min 4.7s 即返回 500)，不是
处理超时。改成：sidecar 装 ffmpeg → /transcribe endpoint 把音频切 60s
段 → 串行调外部 ASR → 拼接 transcript。notes 主容器 call_asr 改成 POST
到 sidecar /transcribe（timeout 1h 给长录音留余地）。

- feishu sidecar Dockerfile + ffmpeg + requests
- server.py 加 TranscribeReq；fallback -c copy 失败时 re-encode AAC
- main.rs 删除 asr_url/asr_token 字段（now sidecar concern）
- k8s manifest: ASR_URL/ASR_TOKEN 从主容器移到 feishu sidecar env

apps/notes/src/main.rs

@@ -31,8 +31,6 @@ struct AppState {
     db: Arc<Mutex<Connection>>,
     blobs_dir: PathBuf,
     passphrase: String,
-    asr_url: String,
-    asr_token: String,
     llm_gateway: String,
     llm_token: String,
     llm_model: String,
@@ -53,9 +51,7 @@ async fn main() -> std::io::Result<()> {
     if passphrase.is_empty() {
         tracing::warn!("PASSPHRASE not set — all /api/* will return 401");
     }
-    let asr_url = std::env::var("ASR_URL")
-        .unwrap_or_else(|_| "http://18.159.112.195:8848/v1/audio/transcriptions".into());
-    let asr_token = std::env::var("ASR_TOKEN").unwrap_or_default();
+    // ASR 现在由 sidecar 调（切片串行），主容器不再直接调外部 ASR
     let llm_gateway =
         std::env::var("LLM_GATEWAY").unwrap_or_else(|_| "http://3.135.65.204:8848/v1".into());
     let llm_token = std::env::var("LLM_TOKEN").unwrap_or_default();
@@ -95,8 +91,6 @@ async fn main() -> std::io::Result<()> {
         db: Arc::new(Mutex::new(conn)),
         blobs_dir,
         passphrase,
-        asr_url,
-        asr_token,
         llm_gateway,
         llm_token,
         llm_model,
@@ -465,38 +459,30 @@ fn set_status(s: &AppState, id: i64, status: &str, transcript: Option<&str>, err
 async fn call_asr(
     s: &AppState,
     path: &std::path::Path,
-    filename: &str,
+    _filename: &str,
 ) -> Result<String, String> {
-    let bytes = tokio::fs::read(path).await.map_err(|e| e.to_string())?;
-    let part = reqwest::multipart::Part::bytes(bytes)
-        .file_name(filename.to_string())
-        .mime_str("audio/mpeg")
-        .map_err(|e| e.to_string())?;
-    let form = reqwest::multipart::Form::new()
-        .text("model", "qwen3-asr")
-        .text("response_format", "json")
-        .part("file", part);
-
+    // 走 sidecar /transcribe：sidecar 用 ffmpeg 切片 + 串行调外部 ASR，绕过 ASR server 单文件大小限制
+    let url = format!("{}/transcribe", s.feishu_url.trim_end_matches('/'));
+    let payload = json!({ "audio_path": path.to_string_lossy() });
     let resp = s
         .http
-        .post(&s.asr_url)
-        .bearer_auth(&s.asr_token)
-        .multipart(form)
-        .timeout(std::time::Duration::from_secs(600))
+        .post(&url)
+        .json(&payload)
+        .timeout(std::time::Duration::from_secs(3600))
         .send()
         .await
-        .map_err(|e| format!("connect: {e}"))?;
+        .map_err(|e| format!("connect sidecar: {e}"))?;
     if !resp.status().is_success() {
         let st = resp.status();
         let body = resp.text().await.unwrap_or_default();
-        return Err(format!("ASR {st}: {body}"));
+        return Err(format!("sidecar /transcribe {st}: {body}"));
     }
     let v: Value = resp.json().await.map_err(|e| format!("decode: {e}"))?;
     let text = v
         .get("text")
         .and_then(|x| x.as_str())
         .map(|s| s.to_string())
-        .ok_or_else(|| format!("ASR response no 'text': {v}"))?;
+        .ok_or_else(|| format!("no 'text' in response: {v}"))?;
     Ok(text)
 }