feat: 企业微信机器人集成到后端服务，网页端可配置和重启

- BotManager: 后端启动时自动检测配置并拉起机器人（后台线程）
- WeComBotService: 新增 start_async() 异步模式，支持嵌入事件循环
- settings API: 增加 bot 配置字段（enabled/bot_id/secret）
- settings API: 增加 bot/status 和 bot/restart 端点
- 前端设置页: 增加企业微信机器人配置卡片（启用开关/ID/Secret）
- 前端设置页: 增加机器人状态徽章和重启按钮
- Secret 脱敏显示，仅展示前4位

app/api/v1/settings.py

@@ -12,6 +12,15 @@ from app.config import settings
 router = APIRouter()
 
 
+def _mask_secret(value: str | None, visible: int = 4) -> str | None:
+    """对敏感字符串脱敏，保留前 visible 个字符"""
+    if not value:
+        return None
+    if len(value) <= visible:
+        return "****"
+    return value[:visible] + "****"
+
+
 class SettingsResponse(BaseModel):
     """设置响应（隐藏敏感信息的中间位）"""
     embedding_provider: str
@@ -37,6 +46,10 @@ class SettingsResponse(BaseModel):
     has_dashscope_key: bool
     has_aliyun_ocr: bool
     has_tencent_ocr: bool
+    # 企业微信机器人
+    wework_bot_enabled: bool
+    wework_bot_id: str | None
+    wework_bot_secret_masked: str | None
 
 
 @router.get("", response_model=SettingsResponse, summary="获取当前设置")
@@ -65,6 +78,9 @@ async def get_settings():
         has_dashscope_key=bool(settings.DASHSCOPE_API_KEY),
         has_aliyun_ocr=bool(settings.ALIYUN_OCR_ACCESS_KEY),
         has_tencent_ocr=bool(settings.TENCENT_OCR_SECRET_ID),
+        wework_bot_enabled=settings.WEWORK_BOT_ENABLED,
+        wework_bot_id=settings.WEWORK_BOT_ID,
+        wework_bot_secret_masked=_mask_secret(settings.WEWORK_BOT_SECRET),
     )
 
 
@@ -94,6 +110,10 @@ class SettingsUpdate(BaseModel):
     chunk_overlap: int | None = None
     search_limit: int | None = None
     judge_batch_size: int | None = None
+    # 企业微信机器人
+    wework_bot_enabled: bool | None = None
+    wework_bot_id: str | None = None
+    wework_bot_secret: str | None = None
 
 
 @router.put("", summary="更新设置")
@@ -139,6 +159,9 @@ async def update_settings(data: SettingsUpdate):
         "chunk_overlap": "CHUNK_OVERLAP",
         "search_limit": "SEARCH_LIMIT",
         "judge_batch_size": "JUDGE_BATCH_SIZE",
+        "wework_bot_enabled": "WEWORK_BOT_ENABLED",
+        "wework_bot_id": "WEWORK_BOT_ID",
+        "wework_bot_secret": "WEWORK_BOT_SECRET",
     }
 
     for api_field, config_field in field_map.items():
@@ -221,3 +244,18 @@ async def test_ocr():
         return {"success": True, "message": f"OCR 提供商 {provider.name} 已就绪"}
     except Exception as e:
         return {"success": False, "message": f"OCR 测试失败: {str(e)}"}
+
+
+@router.post("/bot/restart", summary="重启企业微信机器人")
+async def restart_bot():
+    """重启企业微信机器人服务"""
+    from app.main import bot_manager
+    result = await bot_manager.restart()
+    return result
+
+
+@router.get("/bot/status", summary="获取企业微信机器人状态")
+async def get_bot_status():
+    """获取企业微信机器人运行状态"""
+    from app.main import bot_manager
+    return bot_manager.get_status()