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

Time-series endpoint returning monthly/weekly market data points
for the analytics page. Queries MarketIndex aggregated by period
with 6-hour Redis cache. Includes unit tests.

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

apps/api/src/modules/shared/infrastructure/cache.service.ts

@@ -39,6 +39,10 @@ export const CacheTTL = {
   TRENDING_AREAS: 1800, // 30 min
   /** Price movers — 30 min TTL, aggregation over two time windows */
   PRICE_MOVERS: 1800, // 30 min
+  /** Market history — 6 hour TTL, time-series data recomputed nightly */
+  MARKET_HISTORY: 21600, // 6 hours
+  /** AVM valuation estimate per listing — long TTL, model outputs are stable within a day */
+  VALUATION_LISTING: 86400, // 24 h
 } as const;
 
 export enum CachePrefix {
@@ -58,6 +62,7 @@ export enum CachePrefix {
   MARKET_SNAPSHOT = 'cache:analytics:market_snapshot',
   TRENDING_AREAS = 'cache:analytics:trending_areas',
   PRICE_MOVERS = 'cache:analytics:price_movers',
+  MARKET_HISTORY = 'cache:analytics:market_history',
 }
 
 @Injectable()