首个可运行的版本

backend/app/routers/messages.py

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+"""消息路由"""
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.dependencies import get_db, get_current_user
+from app.models.user import User
+from app.schemas.message import MessageSend, MessagePage, MarkReadRequest
+from app.services.message_service import MessageService
+
+router = APIRouter()
+
+
+@router.get("/{conversation_id}/messages", response_model=dict)
+async def get_messages(
+    conversation_id: str,
+    before: str | None = Query(None),
+    limit: int = Query(50, ge=1, le=100),
+    user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    """获取消息列表（游标分页）"""
+    service = MessageService(db)
+    try:
+        return await service.get_messages(conversation_id, user.id, before, limit)
+    except ValueError as e:
+        raise HTTPException(status_code=403, detail=str(e))
+
+
+@router.put("/{conversation_id}/messages/{message_id}/read")
+async def mark_as_read(
+    conversation_id: str,
+    message_id: str,
+    user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    """标记消息已读"""
+    service = MessageService(db)
+    await service.mark_as_read(conversation_id, user.id, message_id)
+    return {"success": True}
+
+
+@router.delete("/{conversation_id}/messages/{message_id}")
+async def delete_message(
+    conversation_id: str,
+    message_id: str,
+    user: User = Depends(get_current_user),
+    db: AsyncSession = Depends(get_db),
+):
+    """删除消息"""
+    service = MessageService(db)
+    try:
+        await service.soft_delete(message_id, user.id)
+        return {"success": True}
+    except ValueError as e:
+        raise HTTPException(status_code=403, detail=str(e))