feat(analytics): integrate AI/ML services — AVM endpoint, moderation pipeline, market index cron

- Add AiServiceClient HTTP client for Python FastAPI AI service with timeout and fallback
- Add HttpAVMService that calls Python AVM endpoint, falls back to PrismaAVMService on failure
- Add ListingCreatedModerationHandler: auto-flags suspicious listings via AI moderation on create
- Add MarketIndexCronService: daily cron job aggregating market stats per district/city/type
- Wire ScheduleModule and new providers into AnalyticsModule and AppModule
- Add unit tests for AiServiceClient, HttpAVMService, and moderation handler (all passing)

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

apps/api/src/app.module.ts

@@ -1,6 +1,7 @@
 import { type MiddlewareConsumer, Module, type NestModule } from '@nestjs/common';
 import { APP_FILTER, APP_GUARD, APP_INTERCEPTOR } from '@nestjs/core';
 import { CqrsModule } from '@nestjs/cqrs';
+import { ScheduleModule } from '@nestjs/schedule';
 import { ThrottlerModule } from '@nestjs/throttler';
 import { SentryGlobalFilter, SentryModule } from '@sentry/nestjs/setup';
 import { AdminModule } from '@modules/admin';
@@ -28,6 +29,7 @@ import { AppController } from './app.controller';
   imports: [
     SentryModule.forRoot(),
     CqrsModule.forRoot(),
+    ScheduleModule.forRoot(),
     SharedModule,
     HealthModule,
     AuthModule,