feat: Implement password reset and email verification with Mailgun

Backend changes:
- Add password reset token database migration (V011)
- Create email service with Mailgun integration (EU/US regions)
- Implement password reset flow with secure token generation
- Add email verification endpoints and logic
- Create beautiful HTML email templates for reset and verification
- Add password reset DTOs with validation
- Update User entity with email verification fields

Frontend changes:
- Create forgot password page with email submission
- Create reset password page with token validation
- Add email verification banner component
- Integrate verification banner into main dashboard
- Add password requirements and validation UI

Features:
- Mailgun API ready for EU and US regions
- Secure token expiration (1h for reset, 24h for verification)
- Rate limiting on resend (2min interval)
- Protection against email enumeration
- IP address and user agent tracking
- Token reuse prevention

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

maternal-web/app/page.tsx

@@ -4,6 +4,7 @@ import { useState, useEffect } from 'react';
 import { Box, Typography, Button, Paper, Grid, CircularProgress } from '@mui/material';
 import { AppShell } from '@/components/layouts/AppShell/AppShell';
 import { ProtectedRoute } from '@/components/common/ProtectedRoute';
+import { EmailVerificationBanner } from '@/components/common/EmailVerificationBanner';
 import {
   Restaurant,
   Hotel,
@@ -84,6 +85,8 @@ export default function HomePage() {
     <ProtectedRoute>
       <AppShell>
         <Box>
+          <EmailVerificationBanner />
+
           <motion.div
             initial={{ opacity: 0, y: 20 }}
             animate={{ opacity: 1, y: 0 }}