feat: serve built SPA with fallback and artwork cache

server/test/app.test.ts

@@ -1,15 +1,9 @@
 import { describe, it, expect } from 'vitest'
 import { buildApp } from '../src/app.js'
 import { openDatabase } from '../src/db.js'
-import type { Config } from '../src/config.js'
+import { testConfig } from './helpers.js'
 
-const config: Config = {
-  dataDir: ':memory:',
-  artworkDir: ':memory:',
-  dbPath: ':memory:',
-  port: 0,
-  sessionSecret: 'test-secret-test-secret-test-secret-1234',
-}
+const config = testConfig()
 
 describe('GET /api/health', () => {
   it('returns ok', async () => {