Add backend with analytics, notifications, and enhanced features

Backend:
- Complete NestJS backend implementation with comprehensive features
- Analytics: Weekly/monthly reports with PDF/CSV export
- Smart notifications: Persistent notifications with milestones and anomaly detection
- AI safety: Medical disclaimer triggers and prompt injection protection
- COPPA/GDPR compliance: Full audit logging system

Frontend:
- Updated settings page and analytics components
- API integration improvements

Docs:
- Added implementation gaps tracking
- Azure OpenAI integration documentation
- Testing and post-launch summaries

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

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

maternal-web/components/analytics/FeedingFrequencyGraph.tsx

@@ -32,6 +32,7 @@ interface FeedingTypeData {
   name: string;
   value: number;
   color: string;
+  [key: string]: string | number;
 }
 
 const COLORS = {
@@ -248,7 +249,7 @@ export default function FeedingFrequencyGraph() {
                 cx="50%"
                 cy="50%"
                 labelLine={false}
-                label={({ name, percent }) => `${name}: ${(percent * 100).toFixed(0)}%`}
+                label={({ name, percent }: any) => `${name}: ${(percent * 100).toFixed(0)}%`}
                 outerRadius={100}
                 fill="#8884d8"
                 dataKey="value"