feat: complete Phase 1 MVP - add agent panel, email notifications, and PDF invoicing

Agent Panel UI:
- Visual dashboard showing all agents with status (idle/working)
- Agent cards with stats: total tasks, completed tasks
- Capabilities display for each agent
- Execution log showing recent agent activity
- Real-time updates (refreshes every 10 seconds)
- Click agent to filter execution log
- Status indicators: pending, running, completed, failed, pending_approval

Email Notifications:
- SMTP email service with HTML templates
- Task assignment notifications
- Agent approval request emails with action details
- Agent completion notifications
- Configurable via environment variables (SMTP_HOST, SMTP_USER, SMTP_PASSWORD, SMTP_TO)
- Integrated with agent executor service

PDF Invoice Generation:
- Professional PDF invoices using ReportLab
- Generate from time entries by project
- Client information and company branding
- Itemized time entries with hours, rates, amounts
- Automatic totals calculation
- Download as PDF attachment
- API endpoints: /api/opc/invoices/generate
- Projects and clients management endpoints

Additional Features:
- Projects CRUD API
- Clients CRUD API
- Project time tracking summary
- Billable vs non-billable hours tracking

Phase 1 MVP 100% 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 (PM, CTO, COO)
✅ Agent panel UI with execution logs
✅ Email notifications (Telegram + Email)
✅ PDF invoice generation

All 12 tasks completed!

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, opc_ws
+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, opc_projects
 import auth as auth_module
 import config
 from rbac import require_page
@@ -199,6 +199,8 @@ app.include_router(opc_tasks.router, prefix="/api/opc",
     dependencies=[Depends(_inject_user), Depends(require_page("opc"))])
 app.include_router(opc_agents.router, prefix="/api/opc",
     dependencies=[Depends(_inject_user), Depends(require_page("opc"))])
+app.include_router(opc_projects.router, prefix="/api/opc",
+    dependencies=[Depends(_inject_user), Depends(require_page("opc"))])
 
 # WebSocket endpoint (auth handled inside handler via auth cookie; query token fallback temporary)
 app.add_api_websocket_route("/ws/terminal", terminal.ws_endpoint)