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/schemas/memory_api_schema.py

@@ -141,10 +141,12 @@ class CreateEndUserRequest(BaseModel):
         other_id: External user identifier (required)
         other_name: Display name for the end user
         memory_config_id: Optional memory config ID. If not provided, uses workspace default.
+        app_id: Optional app ID to bind the end user to.
     """
     other_id: str = Field(..., description="External user identifier (required)")
     other_name: Optional[str] = Field("", description="Display name")
     memory_config_id: Optional[str] = Field(None, description="Memory config ID. Falls back to workspace default if not provided.")
+    app_id: Optional[str] = Field(None, description="App ID to bind the end user to")
 
     @field_validator("other_id")
     @classmethod