refactor: align codebase with EventCrew domain and trim legacy band stack

- Update API: events, users, policies, routes, resources, migrations
- Remove deprecated models/resources (customers, setlists, invitations, etc.)
- Refresh admin app and docs; remove apps/band

Made-with: Cursor

apps/admin/vite.config.ts

@@ -106,6 +106,15 @@ export default defineConfig({
       '@api-utils': fileURLToPath(new URL('./src/plugins/fake-api/utils/', import.meta.url)),
     },
   },
+  server: {
+    port: 5173,
+    proxy: {
+      '/api': {
+        target: 'http://localhost:8000',
+        changeOrigin: true,
+      },
+    },
+  },
   build: {
     chunkSizeWarningLimit: 5000,
   },