feat(memory-api): add end user management and enhance memory API endpoints

- Add end_user_controller with unauthenticated endpoint for creating end users
- Implement get_or_create_end_user logic to handle duplicate end users by other_id
- Register end_user_controller router in main controller initialization
- Add list_memory_configs endpoint to retrieve all workspace memory configurations
- Update MemoryWriteRequest and MemoryReadRequest to make config_id required field
- Refactor memory API endpoints to parse request body directly instead of using Body parameter
- Add CreateEndUserRequest and CreateEndUserResponse schemas for end user creation
- Add ListConfigsResponse schema for configs listing endpoint
- Remove unused config_id and llm_model_id parameters from Neo4j write operation
- Update .gitignore to exclude redbear-mem-metrics and pitch-deck directories

api/app/controllers/end_user_controller.py

@@ -0,0 +1,48 @@
+"""End User 管理接口 - 无需认证"""
+
+from app.core.logging_config import get_business_logger
+from app.core.response_utils import success
+from app.db import get_db
+from app.repositories.end_user_repository import EndUserRepository
+from app.schemas.memory_api_schema import (
+    CreateEndUserRequest,
+    CreateEndUserResponse,
+)
+from fastapi import APIRouter, Depends
+from sqlalchemy.orm import Session
+
+router = APIRouter(prefix="/end_users", tags=["End Users"])
+logger = get_business_logger()
+
+
+@router.post("")
+async def create_end_user(
+    data: CreateEndUserRequest,
+    db: Session = Depends(get_db),
+):
+    """
+    Create an end user.
+    
+    Creates a new end user for the given workspace.
+    If an end user with the same other_id already exists in the workspace,
+    returns the existing one.
+    """
+    logger.info(f"Create end user request - other_id: {data.other_id}, workspace_id: {data.workspace_id}")
+
+    end_user_repo = EndUserRepository(db)
+    end_user = end_user_repo.get_or_create_end_user(
+        app_id=None,
+        workspace_id=data.workspace_id,
+        other_id=data.other_id,
+    )
+
+    logger.info(f"End user ready: {end_user.id}")
+
+    result = {
+        "id": str(end_user.id),
+        "other_id": end_user.other_id or "",
+        "other_name": end_user.other_name or "",
+        "workspace_id": str(end_user.workspace_id),
+    }
+
+    return success(data=CreateEndUserResponse(**result).model_dump(), msg="End user created successfully")