feat: complete Phase 1 MVP - add agent executor and WebSocket real-time updates

Agent Executor Service:
- BaseAgent class with LLM integration via LiteLLM proxy
- AgentExecutor service that processes pending executions every 5 seconds
- Action execution: create_subtask, update_status, send_notification, add_comment
- Approval workflow: CxO level agents require user approval before execution
- Telegram notifications for approvals and completions
- Error handling and execution status tracking

WebSocket Real-Time Updates:
- WebSocket endpoint at /ws/opc for real-time task updates
- ConnectionManager for broadcasting to all connected clients
- Frontend WebSocket client with auto-reconnect
- Live updates for task create/update/move/delete actions
- Agent execution status broadcasts

Integration:
- Agent executor starts on dashboard startup
- Task router broadcasts WebSocket updates on all mutations
- Frontend OPC page subscribes to WebSocket and updates UI in real-time
- Agents (PM, CTO, COO) can now execute tasks autonomously

Phase 1 MVP Complete:
✅ PostgreSQL database with full schema
✅ Task CRUD API with automatic time tracking
✅ Kanban board with drag-and-drop
✅ Agent executor service with LLM integration
✅ WebSocket real-time updates
✅ 3 core agents ready to execute

Next: Agent panel UI, email notifications, PDF invoicing

dashboard/backend/main.py

@@ -6,7 +6,7 @@ from fastapi.responses import JSONResponse
 from slowapi import Limiter
 from slowapi.util import get_remote_address
 from slowapi.errors import RateLimitExceeded
-from routers import docker_router, gitea, files, terminal, system, auth, chat_summary, security, passkey, totp, litellm, cc_connect, info_engine, opc_tasks, opc_agents
+from routers import docker_router, gitea, files, terminal, system, auth, chat_summary, security, passkey, totp, litellm, cc_connect, info_engine, opc_tasks, opc_agents, opc_ws
 import auth as auth_module
 import config
 from rbac import require_page
@@ -121,6 +121,14 @@ async def startup_event():
     except Exception as e:
         logging.getLogger(__name__).error("Failed to initialize OPC database: %s", e)
 
+    # Start agent executor service
+    from services import agent_executor
+    try:
+        asyncio.create_task(agent_executor.start_executor())
+        logging.getLogger(__name__).info("Agent executor service started")
+    except Exception as e:
+        logging.getLogger(__name__).error("Failed to start agent executor: %s", e)
+
     asyncio.create_task(monitor_containers())
 
 @app.get("/api/health")
@@ -194,5 +202,6 @@ app.include_router(opc_agents.router, prefix="/api/opc",
 
 # WebSocket endpoint (auth handled inside handler via auth cookie; query token fallback temporary)
 app.add_api_websocket_route("/ws/terminal", terminal.ws_endpoint)
+app.add_api_websocket_route("/ws/opc", opc_ws.websocket_endpoint)
 
 app.mount("/", StaticFiles(directory="/app/static", html=True), name="static")