refactor(api): replace new Logger() with DI LoggerService and split large files

- Migrate 30 files from `new Logger(ClassName.name)` to injected LoggerService
  for consistent PII masking and centralized logging config
- Split prisma-admin-query.repository.ts (313→121 lines) into admin-stats.queries.ts
  and admin-user.queries.ts
- Split admin.controller.ts (285→154 lines) into admin-moderation.controller.ts
- Split prisma-listing.repository.ts (274→111 lines) into listing-read.queries.ts
- Update 28 test files with mock LoggerService
- All 831 tests passing, zero direct new Logger() calls remaining

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

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

@@ -1,4 +1,5 @@
-import { Injectable, Logger } from '@nestjs/common';
+import { Injectable } from '@nestjs/common';
+import { type LoggerService } from '@modules/shared';
 
 export interface AiPredictRequest {
   area: number;
@@ -51,12 +52,11 @@ export interface IAiServiceClient {
 
 @Injectable()
 export class AiServiceClient implements IAiServiceClient {
-  private readonly logger = new Logger(AiServiceClient.name);
   private readonly baseUrl: string;
   private readonly apiKey: string;
   private readonly timeoutMs: number;
 
-  constructor() {
+  constructor(private readonly logger: LoggerService) {
     this.baseUrl = process.env['AI_SERVICE_URL'] ?? 'http://localhost:8000';
     this.apiKey = process.env['AI_SERVICE_API_KEY'] ?? '';
     this.timeoutMs = Number(process.env['AI_SERVICE_TIMEOUT_MS']) || 5000;