feat: add admin dashboard summary

Add seller-scoped dashboard aggregation and API, private financial summary DTOs, responsive admin metrics, and authenticated E2E coverage.

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

@@ -16,6 +16,7 @@ import { registerPublicSearchRoutes } from '../modules/search/routes/public-sear
 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';
+import { registerAdminDashboardRoutes } from '../modules/dashboard/routes/admin-dashboard-routes.js';
 
 export function buildApp(dependencies) {
   const app = Fastify();
@@ -71,6 +72,10 @@ export function buildApp(dependencies) {
     ...dependencies,
     prefix: '/api/v1/admin',
   });
+  app.register(registerAdminDashboardRoutes, {
+    ...dependencies,
+    prefix: '/api/v1/admin',
+  });
   app.register(registerPublicSearchRoutes, {
     ...dependencies,
     prefix: '/api/v1',