feat: implement ROMs management UI (Phase 8)

Backend (Phase 8.1):
- Add ROMs endpoints: GET, GET/:id, PUT/:id/game, DELETE
- Add metadata search endpoint using IGDB/RAWG/TGDB
- Implement RomsController with ROM CRUD logic
- Add 12 comprehensive ROM endpoint tests
- Configure Vitest to run tests sequentially (threads: false)
- Auto-apply Prisma migrations in test setup

Frontend (Phase 8.2 + 8.3):
- Create ROM types: RomFile, Artwork, EnrichedGame
- Extend API client with roms and metadata namespaces
- Implement 5 custom hooks with TanStack Query
- Create ScanDialog, MetadataSearchDialog, RomCard components
- Rewrite roms.tsx page with table and all actions
- Add 37 comprehensive component and page tests

All 122 tests passing: 63 backend + 59 frontend
Lint: 0 errors, only unused directive warnings

backend/src/app.ts

@@ -5,6 +5,8 @@ import rateLimit from '@fastify/rate-limit';
 import healthRoutes from './routes/health';
 import importRoutes from './routes/import';
 import gamesRoutes from './routes/games';
+import romsRoutes from './routes/roms';
+import metadataRoutes from './routes/metadata';
 
 export function buildApp(): FastifyInstance {
   const app: FastifyInstance = Fastify({
@@ -17,6 +19,8 @@ export function buildApp(): FastifyInstance {
   void app.register(healthRoutes, { prefix: '/api' });
   void app.register(importRoutes, { prefix: '/api' });
   void app.register(gamesRoutes, { prefix: '/api' });
+  void app.register(romsRoutes, { prefix: '/api' });
+  void app.register(metadataRoutes, { prefix: '/api' });
 
   return app;
 }