完整实现 Swarm 多智能体协作系统

- 新增 CLIPluginAdapter 统一接口 (backend/app/core/agent_adapter.py)
- 新增 LLM 服务层，支持 Anthropic/OpenAI/DeepSeek/Ollama (backend/app/services/llm_service.py)
- 新增 Agent 执行引擎，支持文件锁自动管理 (backend/app/services/agent_executor.py)
- 新增 NativeLLMAgent 原生 LLM 适配器 (backend/app/adapters/native_llm_agent.py)
- 新增进程管理器 (backend/app/services/process_manager.py)
- 新增 Agent 控制 API (backend/app/routers/agents_control.py)
- 新增 WebSocket 实时通信 (backend/app/routers/websocket.py)
- 更新前端 AgentsPage，支持启动/停止 Agent
- 测试通过：Agent 启动、批量操作、栅栏同步

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.doc/cache/file_locks.json

@@ -0,0 +1 @@
+{}

.doc/cache/heartbeats.json

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+{
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+    "last_heartbeat": "2026-03-05T10:31:09.197892",
+    "status": "idle",
+    "current_task": "",
+    "progress": 100
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+    "last_heartbeat": "2026-03-05T10:16:03.435209",
+    "status": "waiting",
+    "current_task": "waiting for meeting",
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+    "agent_id": "agent-001",
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+    "status": "working",
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+    "progress": 50
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+  "test-001": {
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+    "last_heartbeat": "2026-03-09T17:23:02.120192",
+    "status": "offline",
+    "current_task": "",
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+  },
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+    "last_heartbeat": "2026-03-09T17:23:43.464396",
+    "status": "waiting",
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+  "dev-001": {
+    "agent_id": "dev-001",
+    "last_heartbeat": "2026-03-09T17:23:43.476403",
+    "status": "waiting",
+    "current_task": "等待会议: meeting-002",
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+    "last_heartbeat": "2026-03-09T17:23:43.485633",
+    "status": "waiting",
+    "current_task": "等待会议: meeting-002",
+    "progress": 0
+  }
+}

.doc/cache/meeting_queue.json

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+{
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+    "title": "Design Review",
+    "expected_attendees": [
+      "claude-001",
+      "kimi-002",
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+    ],
+    "arrived_attendees": [
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+    "status": "waiting",
+    "created_at": "2026-03-05T10:18:10.717613",
+    "started_at": "",
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+    "title": "Quick Test",
+    "expected_attendees": [
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+    ],
+    "arrived_attendees": [
+      "agent-1"
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+    "started_at": "2026-03-05T10:23:53.430888",
+    "min_required": 1
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+    "title": "测试会议",
+    "expected_attendees": [
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+    "started_at": "2026-03-09T09:28:05.357846",
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+  },
+  "meeting-001": {
+    "meeting_id": "meeting-001",
+    "title": "项目设计讨论",
+    "expected_attendees": [
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+      "dev-001",
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+    ],
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+    "started_at": "",
+    "min_required": 3
+  },
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+    "meeting_id": "meeting-002",
+    "title": "测试会议",
+    "expected_attendees": [
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+    "started_at": "2026-03-09T17:23:43.501216",
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+}