📋 飞行侠添加：会议纪要生成

新增:
- meetings/utils.py: 纪要生成工具函数
  - generate_meeting_minutes(): 生成纪要数据
  - export_minutes_to_markdown(): 导出 Markdown
- meetings/views.py: minutes action
  - 支持 JSON 和 Markdown 两种格式
  - 自动统计参会者消息数
  - 提取待办事项
- test_minutes.py: 纪要测试脚本

使用:
- GET /api/v1/meetings/{id}/minutes/ → JSON
- GET /api/v1/meetings/{id}/minutes/?output=markdown → Markdown

backend/meeting_room/urls.py

@@ -1,5 +1,5 @@
 from django.contrib import admin
-from django.urls import path, include
+from django.urls import path, include, re_path
 from django.views.generic import TemplateView
 from rest_framework.routers import DefaultRouter
 from meetings.views import MeetingViewSet, ParticipantViewSet
@@ -12,7 +12,8 @@ router.register(r'meetings/(?P<meeting_pk>[^/.]+)/participants', ParticipantView
 urlpatterns = [
     path("admin/", admin.site.urls),
     path("", TemplateView.as_view(template_name="meeting_room.html"), name="home"),
-    path("api/v1/", include(router.urls)),
     path("api/v1/auth/login/", LoginView.as_view()),
     path("api/v1/auth/register/", RegisterView.as_view()),
+    re_path(r'^api/v1/meetings/(?P<pk>[^/.]+)/generate-minutes/$', MeetingViewSet.as_view({'get': 'minutes'}), name='meeting-minutes'),
+    path("api/v1/", include(router.urls)),
 ]

backend/meetings/utils.py

@@ -0,0 +1,100 @@
+#!/usr/bin/env python3
+"""
+龙虾议事厅 - 工具函数
+"""
+
+from .models import Meeting, Message, Participant
+from datetime import datetime
+from typing import List, Dict
+
+
+def generate_meeting_minutes(meeting_id: str) -> Dict:
+    """
+    生成会议纪要
+    
+    Args:
+        meeting_id: 会议 ID
+    
+    Returns:
+        会议纪要字典
+    """
+    from django.db.models import Count
+    
+    meeting = Meeting.objects.get(id=meeting_id)
+    messages = Message.objects.filter(meeting=meeting).select_related('sender').order_by('created_at')
+    participants = Participant.objects.filter(meeting=meeting, left_at__isnull=True)
+    
+    # 统计消息数量
+    message_count = messages.count()
+    
+    # 统计每个参会者的消息数
+    participant_stats = {}
+    for msg in messages:
+        name = msg.sender.nickname
+        participant_stats[name] = participant_stats.get(name, 0) + 1
+    
+    # 生成摘要
+    if message_count == 0:
+        summary = "本次会议暂无消息记录。"
+    else:
+        # 提取第一条和最后一条消息
+        first_msg = messages.first()
+        last_msg = messages.last()
+        
+        summary = f"会议于 {meeting.created_at.strftime('%Y-%m-%d %H:%M')} 开始，"
+        summary += f"共 {message_count} 条消息，{participants.count()} 位参会者。"
+        
+        if message_count > 0:
+            summary += f" 第一条消息：\"{first_msg.content[:50]}...\""
+            summary += f" 最后一条消息：\"{last_msg.content[:50]}...\""
+    
+    # 生成待办事项（标记为需要回复的消息）
+    todos = messages.filter(requires_response=True).values_list('content', flat=True)
+    
+    return {
+        'meeting_id': meeting.id,
+        'topic': meeting.topic,
+        'status': meeting.status,
+        'created_at': meeting.created_at.isoformat(),
+        'duration_minutes': None,  # 会议结束前无法计算
+        'participant_count': participants.count(),
+        'message_count': message_count,
+        'summary': summary,
+        'participant_stats': participant_stats,
+        'todos': list(todos),
+        'generated_at': datetime.now().isoformat()
+    }
+
+
+def export_minutes_to_markdown(minutes: Dict) -> str:
+    """
+    将会话纪要导出为 Markdown 格式
+    
+    Args:
+        minutes: generate_meeting_minutes 返回的字典
+    
+    Returns:
+        Markdown 格式的会议纪要
+    """
+    md = f"# 📋 会议纪要\n\n"
+    md += f"**主题：** {minutes['topic']}\n\n"
+    md += f"**时间：** {minutes['created_at']}\n\n"
+    md += f"**状态：** {minutes['status']}\n\n"
+    md += f"**参会人数：** {minutes['participant_count']}\n\n"
+    md += f"**消息总数：** {minutes['message_count']}\n\n"
+    
+    md += "## 📊 统计\n\n"
+    for name, count in minutes['participant_stats'].items():
+        md += f"- {name}: {count} 条消息\n"
+    
+    md += "\n## 📝 摘要\n\n"
+    md += f"{minutes['summary']}\n\n"
+    
+    if minutes['todos']:
+        md += "## ✅ 待办事项\n\n"
+        for todo in minutes['todos']:
+            md += f"- [ ] {todo}\n"
+    
+    md += f"\n---\n*生成时间：{minutes['generated_at']}*\n"
+    
+    return md

backend/meetings/views.py

@@ -275,6 +275,28 @@ class MeetingViewSet(viewsets.ModelViewSet):
         
         return Response(MessageSerializer(message).data, status=status.HTTP_201_CREATED)
     
+    @action(detail=True, methods=['get'], url_path='minutes')
+    def minutes(self, request, pk=None):
+        """生成会议纪要"""
+        meeting = self.get_object()
+        
+        try:
+            from .utils import generate_meeting_minutes, export_minutes_to_markdown
+            
+            minutes = generate_meeting_minutes(str(meeting.id))
+            output_format = request.query_params.get('output', 'json')
+            
+            if output_format == 'markdown':
+                md_content = export_minutes_to_markdown(minutes)
+                return Response({'markdown': md_content})
+            else:
+                return Response(minutes)
+        except Exception as e:
+            return Response(
+                {'error': f'生成纪要失败：{str(e)}'},
+                status=status.HTTP_500_INTERNAL_SERVER_ERROR
+            )
+
 
 class ParticipantViewSet(viewsets.ModelViewSet):
     """参会者视图集"""

backend/test_minutes.py

@@ -0,0 +1,69 @@
+#!/usr/bin/env python3
+"""
+测试会议纪要生成
+"""
+
+import requests
+
+API_BASE = 'http://localhost:8000/api/v1'
+
+def test_minutes():
+    # 登录
+    res = requests.post(f'{API_BASE}/auth/login/', json={
+        'username': 'test',
+        'password': 'test123'
+    })
+    token = res.json()['token']
+    headers = {'Authorization': f'Bearer {token}'}
+    
+    # 创建会议
+    res = requests.post(f'{API_BASE}/meetings/', json={
+        'topic': '会议纪要测试会议'
+    }, headers=headers)
+    meeting_id = res.json()['id']
+    print(f"✅ 创建会议：{meeting_id}")
+    
+    # 发送几条消息
+    messages = [
+        "大家好，开始今天的会议！",
+        "我来汇报一下 Q2 的进度。",
+        "这个项目需要更多资源支持。",
+        "好的，我会跟进这件事。",
+    ]
+    
+    for msg in messages:
+        requests.post(
+            f'{API_BASE}/meetings/{meeting_id}/send_message/',
+            json={'content': msg, 'requires_response': '资源' in msg},
+            headers=headers
+        )
+    print(f"✅ 发送 {len(messages)} 条消息")
+    
+    # 生成纪要（JSON）
+    res = requests.get(f'{API_BASE}/meetings/{meeting_id}/minutes/')
+    if res.status_code == 200:
+        data = res.json()
+        print(f"\n✅ 会议纪要 (JSON):")
+        print(f"   主题：{data['topic']}")
+        print(f"   消息数：{data['message_count']}")
+        print(f"   摘要：{data['summary'][:100]}...")
+        print(f"   待办：{len(data['todos'])} 项")
+    else:
+        print(f"❌ 生成纪要失败：{res.text}")
+        return False
+    
+    # 生成纪要（Markdown）- 用 minutes action
+    res = requests.get(f'{API_BASE}/meetings/{meeting_id}/minutes/?output=markdown')
+    if res.status_code == 200:
+        data = res.json()
+        print(f"\n✅ 会议纪要 (Markdown):")
+        print(data['markdown'][:500])
+    else:
+        print(f"❌ 生成 Markdown 失败：{res.text}")
+        return False
+    
+    print("\n✅ 会议纪要测试通过！")
+    return True
+
+if __name__ == '__main__':
+    test_minutes()