feat: 新增睿美云对接模块

- 扩展 ToolConfig 配置类型，新增 external_api 类型
- 实现接口注册表，包含 90+ 睿美云开放接口定义
- 实现 TPOS SHA256WithRSA 签名鉴权
- 实现睿美云 API 客户端，支持多租户配置
- 新增代理路由 /api/ruimeiyun/call/{api_name}
- 支持接口权限控制和健康检查

backend/app/main.py

@@ -16,6 +16,8 @@ from .routers.cost import router as cost_router
 from .routers.quota import router as quota_router
 from .routers.tasks import router as tasks_router
 from .routers.notification_channels import router as notification_channels_router
+from .routers.tool_configs import router as tool_configs_router
+from .routers.ruimeiyun import router as ruimeiyun_router
 from .middleware import TraceMiddleware, setup_exception_handlers, RequestLoggerMiddleware
 from .middleware.trace import setup_logging
 from .services.scheduler import scheduler_service
@@ -71,6 +73,8 @@ app.include_router(cost_router, prefix="/api")
 app.include_router(quota_router, prefix="/api")
 app.include_router(tasks_router)
 app.include_router(notification_channels_router)
+app.include_router(tool_configs_router, prefix="/api")
+app.include_router(ruimeiyun_router, prefix="/api")
 
 
 # 应用生命周期事件