checkpoint: require_redis 显式 503 守卫——存储类接口（AI配置/在线/缓存/验证码）接线

- dependencies: require_redis 改标准 FastAPI 依赖（Depends(redis_getter)），Redis 不可用显式 503 而非 500/静默空数据
- AI配置 5 端点 / 在线监控 5 端点 / 缓存监控 6 端点切到 require_redis
- 免认证验证码端点（captcha/get、slider/complete）也接线：Redis 挂时返回 503 而非 500
- login/token/oauth 保留 redis_getter（服务层内联 503 守卫语义不变）

backend/app/api/v1/module_monitor/online/controller.py

@@ -8,7 +8,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from app.common.request import PaginationService
 from app.common.response import ResponseSchema, SuccessResponse
 from app.core.base_schema import AuthSchema, PaginationQueryParam
-from app.core.dependencies import AuthPermission, db_getter, get_current_user, redis_getter
+from app.core.dependencies import AuthPermission, db_getter, get_current_user, require_redis
 from app.core.router_class import OperationLogRoute
 
 from .schema import DashboardStatsSchema, OnlineOutSchema, OnlineQueryParam
@@ -19,7 +19,7 @@ OnlineRouter = APIRouter(route_class=OperationLogRoute, prefix="/online", tags=[
 
 @OnlineRouter.get("/list", summary="获取在线用户列表", response_model=ResponseSchema[list[OnlineOutSchema]], dependencies=[Security(AuthPermission(["module_monitor:online:query"]))])
 async def get_online_list_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
     page: Annotated[PaginationQueryParam, Depends()],
     search: Annotated[OnlineQueryParam, Query()],
 ) -> JSONResponse:
@@ -34,7 +34,7 @@ async def get_online_list_controller(
 
 @OnlineRouter.get("/current", summary="获取当前用户的在线会话", response_model=ResponseSchema[list[OnlineOutSchema]], dependencies=[Depends(get_current_user)])
 async def get_current_online_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
     auth: Annotated[AuthSchema, Depends(get_current_user)],
 ) -> JSONResponse:
     sessions = await OnlineService.get_current_user_sessions(redis=redis, user_id=auth.user.id)
@@ -44,7 +44,7 @@ async def get_current_online_controller(
 @OnlineRouter.delete("/delete", summary="强制下线", response_model=ResponseSchema[None], dependencies=[Security(AuthPermission(["module_monitor:online:delete"]))])
 async def delete_online_controller(
     session_id: Annotated[str, Body(description="会话编号")],
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
 ) -> JSONResponse:
     await OnlineService.delete_online(redis=redis, session_id=session_id)
     return SuccessResponse(msg="强制下线成功")
@@ -52,7 +52,7 @@ async def delete_online_controller(
 
 @OnlineRouter.delete("/clear", summary="清除所有在线用户", response_model=ResponseSchema[None], dependencies=[Security(AuthPermission(["module_monitor:online:delete"]))])
 async def clear_online_controller(
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
 ) -> JSONResponse:
     await OnlineService.clear_online(redis=redis)
     return SuccessResponse(msg="清除所有在线用户成功")
@@ -61,7 +61,7 @@ async def clear_online_controller(
 @OnlineRouter.get("/stats", summary="获取仪表盘统计数据", response_model=ResponseSchema[DashboardStatsSchema])
 async def get_dashboard_stats_controller(
     db: Annotated[AsyncSession, Depends(db_getter)],
-    redis: Annotated[Redis, Depends(redis_getter)],
+    redis: Annotated[Redis, Depends(require_redis)],
     _auth: Annotated[AuthSchema, Security(AuthPermission(["module_monitor:dashboard:query"]))],
 ) -> JSONResponse:
     data = await OnlineService.get_dashboard_stats(db=db, redis=redis)