fix: 恢复应用管理的配置项定义功能

定时任务提交(104487f)误删了应用 config_schema 相关代码，现恢复：
- backend/app/models/app.py: 恢复 config_schema 数据库字段
- backend/app/routers/apps.py: 恢复 ConfigSchemaItem、API 路由、格式化函数
- frontend/src/views/apps/index.vue: 恢复配置项编辑 UI

backend/app/models/app.py

@@ -18,6 +18,11 @@ class App(Base):
     # [{"code": "brainstorm", "name": "头脑风暴", "path": "/brainstorm"}, ...]
     tools = Column(Text)
     
+    # 配置项定义（JSON 数组）- 定义租户可配置的参数
+    # [{"key": "industry", "label": "行业类型", "type": "radio", "options": [...], "default": "...", "required": false}, ...]
+    # type: text(文本) | radio(单选) | select(下拉多选) | switch(开关)
+    config_schema = Column(Text)
+    
     # 是否需要企微JS-SDK
     require_jssdk = Column(SmallInteger, default=0)  # 0-不需要 1-需要
     

backend/app/routers/apps.py

@@ -23,6 +23,18 @@ class ToolItem(BaseModel):
     path: str
 
 
+class ConfigSchemaItem(BaseModel):
+    """配置项定义"""
+    key: str  # 配置键
+    label: str  # 显示标签
+    type: str  # text | radio | select | switch
+    options: Optional[List[str]] = None  # radio/select 的选项值
+    option_labels: Optional[dict] = None  # 选项显示名称 {"value": "显示名"}
+    default: Optional[str] = None  # 默认值
+    placeholder: Optional[str] = None  # 输入提示（text类型）
+    required: bool = False  # 是否必填
+
+
 class AppCreate(BaseModel):
     """创建应用"""
     app_code: str
@@ -30,6 +42,7 @@ class AppCreate(BaseModel):
     base_url: Optional[str] = None
     description: Optional[str] = None
     tools: Optional[List[ToolItem]] = None
+    config_schema: Optional[List[ConfigSchemaItem]] = None
     require_jssdk: bool = False
 
 
@@ -39,6 +52,7 @@ class AppUpdate(BaseModel):
     base_url: Optional[str] = None
     description: Optional[str] = None
     tools: Optional[List[ToolItem]] = None
+    config_schema: Optional[List[ConfigSchemaItem]] = None
     require_jssdk: Optional[bool] = None
     status: Optional[int] = None
 
@@ -119,6 +133,7 @@ async def create_app(
         base_url=data.base_url,
         description=data.description,
         tools=json.dumps([t.model_dump() for t in data.tools], ensure_ascii=False) if data.tools else None,
+        config_schema=json.dumps([c.model_dump() for c in data.config_schema], ensure_ascii=False) if data.config_schema else None,
         require_jssdk=1 if data.require_jssdk else 0,
         status=1
     )
@@ -150,6 +165,13 @@ async def update_app(
         else:
             update_data['tools'] = None
     
+    # 处理 config_schema JSON
+    if 'config_schema' in update_data:
+        if update_data['config_schema']:
+            update_data['config_schema'] = json.dumps([c.model_dump() if hasattr(c, 'model_dump') else c for c in update_data['config_schema']], ensure_ascii=False)
+        else:
+            update_data['config_schema'] = None
+    
     # 处理 require_jssdk
     if 'require_jssdk' in update_data:
         update_data['require_jssdk'] = 1 if update_data['require_jssdk'] else 0
@@ -259,6 +281,21 @@ async def get_app_tools(
     return tools
 
 
+@router.get("/{app_code}/config-schema")
+async def get_app_config_schema(
+    app_code: str,
+    user: User = Depends(get_current_user),
+    db: Session = Depends(get_db)
+):
+    """获取应用的配置项定义（用于租户订阅时渲染表单）"""
+    app = db.query(App).filter(App.app_code == app_code).first()
+    if not app:
+        raise HTTPException(status_code=404, detail="应用不存在")
+    
+    config_schema = json.loads(app.config_schema) if app.config_schema else []
+    return config_schema
+
+
 def format_app(app: App) -> dict:
     """格式化应用数据"""
     return {
@@ -268,6 +305,7 @@ def format_app(app: App) -> dict:
         "base_url": app.base_url,
         "description": app.description,
         "tools": json.loads(app.tools) if app.tools else [],
+        "config_schema": json.loads(app.config_schema) if app.config_schema else [],
         "require_jssdk": bool(app.require_jssdk),
         "status": app.status,
         "created_at": app.created_at,