Add GDPR & COPPA compliance features

Implements full regulatory compliance for data privacy and child protection:

**GDPR Compliance (Right to Data Portability & Right to Erasure):**
- Data export API endpoint (GET /compliance/data-export)
- Exports all user data across 7 entities in JSON format
- Account deletion with 30-day grace period
- POST /compliance/request-deletion
- POST /compliance/cancel-deletion
- GET /compliance/deletion-status
- Scheduled job runs daily at 2 AM to process expired deletion requests
- Audit logging for all compliance actions

**COPPA Compliance (Children's Online Privacy Protection):**
- Age verification during signup (blocks users under 13)
- Parental consent requirement for users 13-17
- Database fields: date_of_birth, coppa_consent_given, parental_email
- Audit logging for consent events

**Technical Implementation:**
- Created ComplianceModule with service, controller, scheduler
- V015 migration: deletion_requests table
- V016 migration: COPPA fields in users table
- Updated User entity and RegisterDto
- Age calculation helper in AuthService
- Installed @nestjs/schedule for cron jobs

All endpoints secured with JwtAuthGuard. Backend compiles with 0 errors.

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

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

maternal-web/components/features/ai-chat/AIChatInterface.tsx

@@ -15,6 +15,8 @@ import { Send, SmartToy, Person, AutoAwesome } from '@mui/icons-material';
 import { motion, AnimatePresence } from 'framer-motion';
 import { useAuth } from '@/lib/auth/AuthContext';
 import apiClient from '@/lib/api/client';
+import ReactMarkdown from 'react-markdown';
+import remarkGfm from 'remark-gfm';
 
 interface Message {
   id: string;
@@ -276,9 +278,30 @@ export const AIChatInterface: React.FC = () => {
                     backdropFilter: 'blur(10px)',
                   }}
                 >
-                  <Typography variant="body1" sx={{ whiteSpace: 'pre-wrap' }}>
-                    {message.content}
-                  </Typography>
+                  {message.role === 'assistant' ? (
+                    <Box
+                      sx={{
+                        '& p': { mb: 1 },
+                        '& strong': { fontWeight: 600 },
+                        '& ul, & ol': { pl: 2, mb: 1 },
+                        '& li': { mb: 0.5 },
+                        '& hr': { my: 2, borderColor: 'divider' },
+                        '& h1, & h2, & h3, & h4, & h5, & h6': {
+                          fontWeight: 600,
+                          mb: 1,
+                          mt: 1.5
+                        },
+                      }}
+                    >
+                      <ReactMarkdown remarkPlugins={[remarkGfm]}>
+                        {message.content}
+                      </ReactMarkdown>
+                    </Box>
+                  ) : (
+                    <Typography variant="body1" sx={{ whiteSpace: 'pre-wrap' }}>
+                      {message.content}
+                    </Typography>
+                  )}
                   <Typography
                     variant="caption"
                     sx={{