feat: optional worker selection when creating workflow (API + frontend dropdown)

src/agent.rs

@@ -20,7 +20,7 @@ pub struct ServiceInfo {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(tag = "type")]
 pub enum AgentEvent {
-    NewRequirement { workflow_id: String, requirement: String, template_id: Option<String> },
+    NewRequirement { workflow_id: String, requirement: String, template_id: Option<String>, #[serde(default)] worker: Option<String> },
     Comment { workflow_id: String, content: String },
 }
 
@@ -113,7 +113,7 @@ impl AgentManager {
     /// Dispatch an event to a worker.
     pub async fn send_event(self: &Arc<Self>, project_id: &str, event: AgentEvent) {
         match event {
-            AgentEvent::NewRequirement { workflow_id, requirement, template_id } => {
+            AgentEvent::NewRequirement { workflow_id, requirement, template_id, worker } => {
                 // Generate title (heuristic)
                 let title = generate_title_heuristic(&requirement);
                 let _ = sqlx::query("UPDATE projects SET name = ? WHERE id = ?")
@@ -154,12 +154,12 @@ impl AgentManager {
                 };
 
                 // Retry dispatch up to 3 times (worker might be reconnecting)
-                let mut dispatch_result = self.worker_mgr.assign_workflow(assign.clone()).await;
+                let mut dispatch_result = self.worker_mgr.assign_workflow(assign.clone(), worker.as_deref()).await;
                 for attempt in 1..3 {
                     if dispatch_result.is_ok() { break; }
                     tracing::warn!("Dispatch attempt {} failed, retrying in 5s...", attempt);
                     tokio::time::sleep(std::time::Duration::from_secs(5)).await;
-                    dispatch_result = self.worker_mgr.assign_workflow(assign.clone()).await;
+                    dispatch_result = self.worker_mgr.assign_workflow(assign.clone(), worker.as_deref()).await;
                 }
 
                 match dispatch_result {
@@ -247,7 +247,7 @@ impl AgentManager {
                                 .clone()
                         };
 
-                        match self.worker_mgr.assign_workflow(assign).await {
+                        match self.worker_mgr.assign_workflow(assign, None).await {
                             Ok(name) => {
                                 let _ = sqlx::query("UPDATE workflows SET status = 'executing', status_reason = '' WHERE id = ?")
                                     .bind(&workflow_id).execute(&self.pool).await;

src/api/workers.rs

@@ -6,6 +6,7 @@ use crate::worker::WorkerInfo;
 
 async fn list_workers(State(state): State<Arc<AppState>>) -> Json<Vec<WorkerInfo>> {
     let workers = state.agent_mgr.worker_mgr.list().await;
+    // WorkerInfo already contains `name` field from registration
     let entries: Vec<WorkerInfo> = workers.into_iter().map(|(_, info)| info).collect();
     Json(entries)
 }

src/api/workflows.rs

@@ -25,6 +25,8 @@ pub struct CreateWorkflow {
     pub requirement: String,
     #[serde(default)]
     pub template_id: Option<String>,
+    #[serde(default)]
+    pub worker: Option<String>,
 }
 
 #[derive(Deserialize)]
@@ -78,6 +80,7 @@ async fn create_workflow(
         workflow_id: workflow.id.clone(),
         requirement: workflow.requirement.clone(),
         template_id: input.template_id,
+        worker: input.worker,
     }).await;
 
     Ok(Json(workflow))

src/main.rs

@@ -211,6 +211,7 @@ async fn resume_workflows(pool: SqlitePool, agent_mgr: Arc<agent::AgentManager>)
             workflow_id,
             requirement,
             template_id: None,
+            worker: None,
         }).await;
     }
 }

src/timer.rs

@@ -69,6 +69,7 @@ async fn check_timers(pool: &SqlitePool, agent_mgr: &Arc<AgentManager>) -> anyho
             workflow_id,
             requirement: timer.requirement.clone(),
             template_id: None,
+            worker: None,
         }).await;
     }
 

src/worker.rs

@@ -118,17 +118,22 @@ impl WorkerManager {
             .collect()
     }
 
-    /// Assign a workflow to the first available worker. Returns worker name.
-    pub async fn assign_workflow(&self, assign: ServerToWorker) -> Result<String, String> {
+    /// Assign a workflow to a worker. If `preferred` is specified, use that worker;
+    /// otherwise pick the first available.
+    pub async fn assign_workflow(&self, assign: ServerToWorker, preferred: Option<&str>) -> Result<String, String> {
         let workflow_id = match &assign {
             ServerToWorker::WorkflowAssign { workflow_id, .. } => workflow_id.clone(),
             _ => return Err("Not a workflow assignment".into()),
         };
 
         let workers = self.workers.read().await;
-        // Pick first worker (simple strategy for now)
-        let (name, worker) = workers.iter().next()
-            .ok_or_else(|| "No workers available".to_string())?;
+        let (name, worker) = if let Some(pref) = preferred {
+            workers.get_key_value(pref)
+                .ok_or_else(|| format!("Worker '{}' not available", pref))?
+        } else {
+            workers.iter().next()
+                .ok_or_else(|| "No workers available".to_string())?
+        };
 
         worker.tx.send(assign).await.map_err(|_| {
             format!("Worker '{}' disconnected", name)

web/src/api.ts

@@ -45,10 +45,10 @@ export const api = {
   listWorkflows: (projectId: string) =>
     request<Workflow[]>(`/projects/${projectId}/workflows`),
 
-  createWorkflow: (projectId: string, requirement: string, templateId?: string) =>
+  createWorkflow: (projectId: string, requirement: string, templateId?: string, worker?: string) =>
     request<Workflow>(`/projects/${projectId}/workflows`, {
       method: 'POST',
-      body: JSON.stringify({ requirement, template_id: templateId || undefined }),
+      body: JSON.stringify({ requirement, template_id: templateId || undefined, worker: worker || undefined }),
     }),
 
   listTemplates: () =>
@@ -93,6 +93,9 @@ export const api = {
   deleteTimer: (timerId: string) =>
     request<void>(`/timers/${timerId}`, { method: 'DELETE' }),
 
+  listWorkers: () =>
+    request<{ name: string; cpu: string; memory: string; gpu: string }[]>('/workers'),
+
   getKb: () => request<{ content: string }>('/kb'),
 
   listArticles: () => request<KbArticleSummary[]>('/kb/articles'),

web/src/components/RequirementSection.vue

@@ -1,5 +1,6 @@
 <script setup lang="ts">
-import { ref, watch } from 'vue'
+import { ref, watch, onMounted } from 'vue'
+import { api } from '../api'
 
 const props = defineProps<{
   requirement: string
@@ -7,13 +8,20 @@ const props = defineProps<{
 }>()
 
 const emit = defineEmits<{
-  submit: [text: string]
+  submit: [text: string, worker?: string]
 }>()
 
 const input = ref('')
 const editing = ref(!props.requirement)
+const workers = ref<{ name: string }[]>([])
+const selectedWorker = ref('')
+
+onMounted(async () => {
+  try {
+    workers.value = await api.listWorkers()
+  } catch { /* ignore */ }
+})
 
-// 当 requirement 从外部更新（如 loadData 完成），自动退出编辑模式
 watch(() => props.requirement, (val) => {
   if (val && editing.value && !input.value.trim()) {
     editing.value = false
@@ -23,7 +31,7 @@ watch(() => props.requirement, (val) => {
 function submit() {
   const text = input.value.trim()
   if (!text) return
-  emit('submit', text)
+  emit('submit', text, selectedWorker.value || undefined)
   editing.value = false
 }
 </script>
@@ -47,7 +55,13 @@ function submit() {
         rows="8"
         @keydown.ctrl.enter="submit"
       />
-      <button class="btn-submit" @click="submit">提交需求</button>
+      <div class="submit-row">
+        <select v-if="workers.length" v-model="selectedWorker" class="worker-select">
+          <option value="">自动选择 Worker</option>
+          <option v-for="w in workers" :key="w.name" :value="w.name">{{ w.name }}</option>
+        </select>
+        <button class="btn-submit" @click="submit">提交需求</button>
+      </div>
     </div>
   </div>
 </template>
@@ -148,8 +162,23 @@ function submit() {
   border-color: var(--accent);
 }
 
+.submit-row {
+  display: flex;
+  align-items: center;
+  justify-content: flex-end;
+  gap: 8px;
+}
+
+.worker-select {
+  padding: 6px 10px;
+  font-size: 12px;
+  background: var(--bg-secondary);
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  color: var(--text-primary);
+}
+
 .btn-submit {
-  align-self: flex-end;
   background: var(--accent);
   color: var(--bg-primary);
   font-weight: 600;

web/src/components/WorkflowView.vue

@@ -147,9 +147,9 @@ watch(() => props.projectId, () => {
   setupWs()
 })
 
-async function onSubmitRequirement(text: string) {
+async function onSubmitRequirement(text: string, worker?: string) {
   try {
-    const wf = await api.createWorkflow(props.projectId, text)
+    const wf = await api.createWorkflow(props.projectId, text, undefined, worker)
     workflow.value = wf
     logEntries.value = []
     planSteps.value = []