feat(analytics): add GET /analytics/market-snapshot endpoint

Dashboard tile endpoint returning activeCount, avgPrice, medianPrice,
priceChangePct (1d/7d/30d), avgPricePerM2, daysOnMarket, newListings24h.
Redis cache-aside with 5min TTL. CQRS query handler with parallel
Prisma queries for p95 <200ms on cache hit.

Refs: TEC-3049

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

apps/api/src/modules/analytics/presentation/dto/get-market-snapshot.dto.ts

@@ -0,0 +1,14 @@
+import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
+import { PropertyType } from '@prisma/client';
+import { IsEnum, IsOptional, IsString } from 'class-validator';
+
+export class GetMarketSnapshotDto {
+  @ApiProperty({ description: 'City name', example: 'HCMC' })
+  @IsString()
+  city!: string;
+
+  @ApiPropertyOptional({ enum: PropertyType, description: 'Property type filter' })
+  @IsOptional()
+  @IsEnum(PropertyType)
+  propertyType?: PropertyType;
+}