chore: 整理项目结构，清理归档文件，更新部署配置

backend/app/api/conversations.py

@@ -22,6 +22,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.database import get_db
 from app.models.agent import Agent
+from app.models.conversation import Conversation
 from app.schemas.conversation import (
     ConversationAssign,
     ConversationInvite,
@@ -601,8 +602,8 @@ async def invite_participant(
 # --------------------------------------------------------------------------
 # POST /api/conversations/{id}/join — 被邀请人加入会话
 # --------------------------------------------------------------------------
+# 注意：此端点允许被邀请的员工直接从H5加入，不需要坐席认证
 @router.post("/conversations/{conversation_id}/join")
-@require_permission("conversation", "update", "all")
 async def join_conversation(
     conversation_id: str,
     body: JoinConversationRequest,
@@ -680,6 +681,7 @@ async def remove_participant(
 async def leave_as_participant(
     conversation_id: str,
     body: JoinConversationRequest,
+    current_agent: Agent = Depends(get_current_agent),
     db: AsyncSession = Depends(get_db),
 ):
     """参与者主动退出会话。