feat: Add GET /api/v1/analytics/advanced/dashboard/:childId endpoint

- Implements comprehensive analytics dashboard aggregating multiple data sources
- Fetches circadian rhythm, anomalies, correlations, growth analysis in parallel
- Includes sleep and feeding trends and clusters
- Provides complete AdvancedAnalyticsDashboard response expected by frontend
- Resolves 404 error on frontend analytics dashboard

Endpoint analysis: 98.8% coverage (81/82 endpoints now implemented)

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

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

maternal-app/maternal-app-backend/src/modules/analytics/analytics.controller.ts

@@ -392,6 +392,62 @@ export class AnalyticsController {
     }
   }
 
+  /**
+   * Advanced Analytics Dashboard - Aggregates all advanced analytics
+   * GET /api/v1/analytics/advanced/dashboard/:childId
+   */
+  @Get('advanced/dashboard/:childId')
+  async getAdvancedDashboard(
+    @CurrentUser() user: any,
+    @Param('childId') childId: string,
+  ) {
+    try {
+      // Fetch all analytics data in parallel for better performance
+      const [
+        circadianRhythm,
+        anomalies,
+        correlations,
+        growthAnalysis,
+        sleepTrends,
+        feedingTrends,
+        sleepClusters,
+        feedingClusters,
+      ] = await Promise.all([
+        this.advancedPatternService.analyzeCircadianRhythm(childId, 14),
+        this.advancedPatternService.detectAnomalies(childId, 30),
+        this.advancedPatternService.analyzeCorrelations(childId, 14),
+        this.growthPercentileService.analyzeGrowth(childId),
+        this.advancedPatternService.analyzeTrends(childId, ActivityType.SLEEP),
+        this.advancedPatternService.analyzeTrends(childId, ActivityType.FEEDING),
+        this.advancedPatternService.clusterActivities(childId, ActivityType.SLEEP, 30),
+        this.advancedPatternService.clusterActivities(childId, ActivityType.FEEDING, 30),
+      ]);
+
+      // Combine all analytics into a comprehensive dashboard
+      const dashboard = {
+        circadianRhythm,
+        anomalies,
+        correlations,
+        growthAnalysis,
+        trends: {
+          sleep: sleepTrends,
+          feeding: feedingTrends,
+        },
+        clusters: {
+          sleep: sleepClusters,
+          feeding: feedingClusters,
+        },
+      };
+
+      return {
+        success: true,
+        data: dashboard,
+      };
+    } catch (error) {
+      throw new BadRequestException(error.message);
+    }
+  }
+
   /**
    * Comprehensive Analytics Dashboard Endpoint
    */