feat(frontend): add assistant delete menu to prompt editor topbar

Place a more-actions dropdown beside the assistant ID with confirmed delete that returns to the assistant list after removal.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/pages/AssistantPage.tsx

@@ -639,6 +639,19 @@ export function AssistantPage(props: AssistantPageProps) {
     );
   }
 
+  async function handleDeleteCurrentAssistant() {
+    if (!editingId) return;
+    const assistantName = form.name.trim() || "未命名助手";
+    if (!window.confirm(`确认删除助手“${assistantName}”？`)) return;
+    setSaveError(null);
+    try {
+      await assistantsApi.remove(editingId);
+      router.push("/assistants");
+    } catch (error) {
+      setSaveError(error instanceof Error ? error.message : "删除失败");
+    }
+  }
+
   // ---- 外部智能体平台（Dify / FastGPT）----
   function fillAgentPlatformForm(a: Assistant): AgentPlatformForm {
     const next: AgentPlatformForm = {
@@ -1611,6 +1624,7 @@ export function AssistantPage(props: AssistantPageProps) {
       tools={tools}
       onBack={() => router.push("/assistants")}
       onSave={() => void handleSavePrompt()}
+      onDelete={() => void handleDeleteCurrentAssistant()}
       updateForm={updateForm}
       handlePromptVisionEnabledChange={handlePromptVisionEnabledChange}
       handlePromptModelChange={handlePromptModelChange}