feat(analytics): add Python NeighborhoodScore service + NestJS HTTP proxy (TEC-2756)

- libs/ai-services: new POST /neighborhood/score router computing weighted
  6-axis livability score from per-category POI counts; algorithm versioned
  for future iteration (sigmoid curves, percentile thresholds).
- apps/api: HttpNeighborhoodScoreService proxies to Python first, falls back
  to PrismaNeighborhoodScoreService when AI service unavailable. Mirrors the
  HttpAVMService pattern. Existing GET /analytics/neighborhoods/:district/score
  endpoint and CQRS handler now flow through the proxy.
- AnalyticsModule binds Http variant by default, retains Prisma variant as
  injectable fallback.
- Tests: 5 pytest cases for Python heuristic, 4 vitest cases for HTTP proxy
  fallback behaviour.

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

apps/api/src/modules/analytics/infrastructure/services/ai-service.client.ts

@@ -91,12 +91,42 @@ export interface AiModerationResponse {
   cleaned_text: string | null;
 }
 
+export interface AiNeighborhoodPOICounts {
+  education: number;
+  healthcare: number;
+  transport: number;
+  shopping: number;
+  greenery: number;
+  safety: number;
+}
+
+export interface AiNeighborhoodScoreRequest {
+  district: string;
+  city: string;
+  poi_counts: AiNeighborhoodPOICounts;
+}
+
+export interface AiNeighborhoodScoreResponse {
+  district: string;
+  city: string;
+  education_score: number;
+  healthcare_score: number;
+  transport_score: number;
+  shopping_score: number;
+  greenery_score: number;
+  safety_score: number;
+  total_score: number;
+  poi_counts: Record<string, number>;
+  algorithm_version: string;
+}
+
 export const AI_SERVICE_CLIENT = Symbol('AI_SERVICE_CLIENT');
 
 export interface IAiServiceClient {
   predict(req: AiPredictRequest): Promise<AiPredictResponse>;
   predictIndustrial(req: AiIndustrialPredictRequest): Promise<AiIndustrialPredictResponse>;
   moderate(req: AiModerationRequest): Promise<AiModerationResponse>;
+  scoreNeighborhood(req: AiNeighborhoodScoreRequest): Promise<AiNeighborhoodScoreResponse>;
   isAvailable(): Promise<boolean>;
 }
 
@@ -124,6 +154,12 @@ export class AiServiceClient implements IAiServiceClient {
     return this.post<AiModerationResponse>('/moderation/check', req);
   }
 
+  async scoreNeighborhood(
+    req: AiNeighborhoodScoreRequest,
+  ): Promise<AiNeighborhoodScoreResponse> {
+    return this.post<AiNeighborhoodScoreResponse>('/neighborhood/score', req);
+  }
+
   async isAvailable(): Promise<boolean> {
     try {
       const response = await fetch(`${this.baseUrl}/health`, {