feat: AI聊天室多Agent协作讨论平台

- 实现Agent管理，支持AI辅助生成系统提示词
- 支持多个AI提供商（OpenRouter、智谱、MiniMax等）
- 实现聊天室和讨论引擎
- WebSocket实时消息推送
- 前端使用React + Ant Design
- 后端使用FastAPI + MongoDB

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/__init__.py

@@ -0,0 +1,22 @@
+"""
+业务服务模块
+"""
+from .ai_provider_service import AIProviderService
+from .agent_service import AgentService
+from .chatroom_service import ChatRoomService
+from .message_router import MessageRouter
+from .discussion_engine import DiscussionEngine
+from .consensus_manager import ConsensusManager
+from .mcp_service import MCPService
+from .memory_service import MemoryService
+
+__all__ = [
+    "AIProviderService",
+    "AgentService",
+    "ChatRoomService",
+    "MessageRouter",
+    "DiscussionEngine",
+    "ConsensusManager",
+    "MCPService",
+    "MemoryService",
+]