feat(memory): Add memory config API controller and end user info endpoints

- Create new memory_config_api_controller.py for dedicated memory configuration management
- Add /end_user/info GET endpoint to retrieve end user information (aliases, metadata)
- Add /end_user/info/update POST endpoint to update end user details
- Move /memory/configs endpoint from memory_api_controller to memory_config_api_controller
- Extract _get_current_user helper function to build user context from API key auth
- Support optional app_id parameter in end user creation with UUID validation
- Update service controller imports with alphabetical ordering and multi-line formatting
- Register memory_config_api_controller router in service module initialization
- Refactor memory_api_controller imports for consistency and clarity

api/app/services/memory_api_service.py

@@ -8,6 +8,8 @@ This service validates inputs and delegates to MemoryAgentService for core memor
 import uuid
 from typing import Any, Dict, Optional
 
+from sqlalchemy.orm import Session
+
 from app.core.error_codes import BizCode
 from app.core.exceptions import BusinessException, ResourceNotFoundException
 from app.core.logging_config import get_logger
@@ -15,7 +17,6 @@ from app.models.app_model import App
 from app.models.end_user_model import EndUser
 from app.schemas.memory_config_schema import ConfigurationError
 from app.services.memory_agent_service import MemoryAgentService
-from sqlalchemy.orm import Session
 
 logger = get_logger(__name__)