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/services/agent_executor.py

@@ -7,6 +7,7 @@ from typing import Dict, Any, Optional
 from datetime import datetime
 from db import opc_db
 from services.agents.base_agent import BaseAgent
+from services import email_service
 import httpx
 import os
 
@@ -273,8 +274,17 @@ Proposed Actions:
 
         message += "\nPlease review and approve in the OPC dashboard."
 
+        # Send Telegram
         await self._send_telegram(message)
 
+        # Send Email
+        await email_service.send_agent_approval_email(
+            agent_name=agent.name,
+            task=task,
+            reasoning=result.get('reasoning', 'No reasoning provided'),
+            actions=result.get('actions', [])
+        )
+
     async def _send_completion_notification(self, agent: BaseAgent, task: Dict[str, Any], result: Dict[str, Any]):
         """Send notification for completed execution"""
         message = f"""✅ *Agent Task Completed*
@@ -284,8 +294,16 @@ Task: {task['title']}
 
 Actions Executed: {len(result.get('actions', []))}
 """
+        # Send Telegram
         await self._send_telegram(message)
 
+        # Send Email
+        await email_service.send_agent_completion_email(
+            agent_name=agent.name,
+            task=task,
+            actions_count=len(result.get('actions', []))
+        )
+
 
 # Global executor instance
 _executor: Optional[AgentExecutor] = None