feat: add pricing observation API

Add seller-owned pricing observation persistence, median market valuation calculation, admin routes, contracts, validation, migration, and focused tests.

apps/api/src/app/server.js

@@ -42,6 +42,8 @@ import { createSaleService } from '../modules/sales/services/sale-service.js';
 import { createAcquisitionRepository } from '../modules/acquisitions/repositories/acquisition-repository.js';
 import { createAcquisitionService } from '../modules/acquisitions/services/acquisition-service.js';
 import { createDashboardService } from '../modules/dashboard/services/dashboard-service.js';
+import { createPricingRepository } from '../modules/pricing/repositories/pricing-repository.js';
+import { createPricingService } from '../modules/pricing/services/pricing-service.js';
 
 function parsePort(value) {
   const port = Number.parseInt(value ?? '3000', 10);
@@ -67,6 +69,7 @@ async function startServer() {
   const conditionRepository = createConditionRepository(database.db);
   const saleRepository = createSaleRepository(database.db);
   const acquisitionRepository = createAcquisitionRepository(database.db);
+  const pricingRepository = createPricingRepository(database.db);
   const userRepository = createUserRepository(database.db);
   const sessionRepository = createSessionRepository(database.db);
   const passwordResetRepository = createPasswordResetRepository(database.db);
@@ -131,6 +134,7 @@ async function startServer() {
       saleService: createSaleService({ saleRepository }),
       acquisitionService: createAcquisitionService({ acquisitionRepository }),
     }),
+    pricingService: createPricingService({ pricingRepository }),
     publicListingService: createPublicListingService({ listingRepository, publicImageService }),
     productService: createProductService({ productRepository }),
     publicProductService: createPublicProductService({ productRepository }),