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/routers/opc_tasks.py

@@ -7,6 +7,7 @@ from pydantic import BaseModel
 from datetime import datetime
 from db import opc_db
 from rbac import require_page, User, _inject_user
+from routers import opc_ws
 
 router = APIRouter()
 
@@ -97,6 +98,9 @@ async def create_task(
             actor=user.username
         )
 
+    # Broadcast WebSocket update
+    await opc_ws.broadcast_task_update(created_task["id"], "created", created_task)
+
     return created_task
 
 
@@ -153,6 +157,10 @@ async def update_task(
         updates=updates,
         actor=user.username
     )
+
+    # Broadcast WebSocket update
+    await opc_ws.broadcast_task_update(task_id, "updated", updated_task)
+
     return updated_task
 
 
@@ -163,6 +171,10 @@ async def delete_task(
 ):
     """Delete a task"""
     await opc_db.delete_task(task_id=task_id, actor=user.username)
+
+    # Broadcast WebSocket update
+    await opc_ws.broadcast_task_update(task_id, "deleted", {"id": task_id})
+
     return {"ok": True}