feat: complete web application — FastAPI backend + Vue 3 SPA frontend

- Full FastAPI backend with JWT auth, file management, processing pipeline,
  memory CRUD, barcode mappings, config management, cloud sync
- Vue 3 + Element Plus frontend with dashboard, task history, HTTP logs,
  memory editor, barcode editor, config editor, sync page
- HTTP request logging middleware with SQLite persistence
- Task history tracking with progress and retry support
- File metadata recording for upload/download operations
- WebAuth section in config.ini for bcrypt password storage
- Bug fix: logs.py count query returns tuple not dict

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/backend/routers/websocket.py

@@ -0,0 +1,47 @@
+"""WebSocket endpoint for real-time task progress."""
+
+from fastapi import APIRouter, WebSocket, WebSocketDisconnect, Query
+from ..auth.jwt_handler import decode_token
+from jose import JWTError
+
+router = APIRouter(tags=["websocket"])
+
+
+@router.websocket("/ws/task/{task_id}")
+async def task_websocket(
+    websocket: WebSocket,
+    task_id: str,
+    token: str = Query(...),
+):
+    """WebSocket for real-time task progress updates."""
+    try:
+        payload = decode_token(token)
+        username = payload.get("sub")
+        if not username:
+            await websocket.close(code=4001, reason="Invalid token")
+            return
+    except (JWTError, Exception):
+        await websocket.close(code=4001, reason="Invalid token")
+        return
+
+    await websocket.accept()
+
+    tm = websocket.app.state.task_manager
+    task = tm.get_task(task_id)
+    if not task:
+        await websocket.send_json({"error": "任务不存在"})
+        await websocket.close()
+        return
+
+    tm.subscribe(task_id, websocket)
+    await websocket.send_json(task.to_dict())
+
+    try:
+        while True:
+            data = await websocket.receive_text()
+            if data == "ping":
+                await websocket.send_text("pong")
+    except WebSocketDisconnect:
+        tm.unsubscribe(task_id, websocket)
+    except Exception:
+        tm.unsubscribe(task_id, websocket)