feat: add acquisition API foundation

Add acquisition persistence, cost-basis calculation, seller-scoped admin routes, contracts, validation, migration, and focused application/HTTP tests.

apps/api/src/app/build-app.js

@@ -15,6 +15,7 @@ import { registerPublicProductRoutes } from '../modules/products/routes/public-p
 import { registerPublicSearchRoutes } from '../modules/search/routes/public-search-routes.js';
 import { registerPublicSellerRoutes } from '../modules/sellers/routes/public-seller-routes.js';
 import { registerAdminSaleRoutes } from '../modules/sales/routes/admin-sale-routes.js';
+import { registerAdminAcquisitionRoutes } from '../modules/acquisitions/routes/admin-acquisition-routes.js';
 
 export function buildApp(dependencies) {
   const app = Fastify();
@@ -66,6 +67,10 @@ export function buildApp(dependencies) {
     ...dependencies,
     prefix: '/api/v1/admin',
   });
+  app.register(registerAdminAcquisitionRoutes, {
+    ...dependencies,
+    prefix: '/api/v1/admin',
+  });
   app.register(registerPublicSearchRoutes, {
     ...dependencies,
     prefix: '/api/v1',