feat(analytics): add NeighborhoodScoreService with POI-based scoring and API endpoint

- Create INeighborhoodScoreService interface and implementation
- Score districts 0-100 across 6 categories: education, healthcare, transport, shopping, greenery, safety
- Calculate scores from POI data with configurable weights and max counts
- Add GetNeighborhoodScoreQuery handler with lazy calculation
- Add GET /analytics/neighborhoods/:district/score endpoint
- Wire service and handler into AnalyticsModule

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/api/src/modules/analytics/domain/services/neighborhood-score.service.ts

@@ -0,0 +1,20 @@
+export const NEIGHBORHOOD_SCORE_SERVICE = Symbol('NEIGHBORHOOD_SCORE_SERVICE');
+
+export interface NeighborhoodScoreResult {
+  district: string;
+  city: string;
+  educationScore: number;
+  healthcareScore: number;
+  transportScore: number;
+  shoppingScore: number;
+  greeneryScore: number;
+  safetyScore: number;
+  totalScore: number;
+  poiCounts: Record<string, number>;
+  calculatedAt: Date;
+}
+
+export interface INeighborhoodScoreService {
+  getScore(district: string, city: string): Promise<NeighborhoodScoreResult | null>;
+  calculateAndSave(district: string, city: string): Promise<NeighborhoodScoreResult>;
+}