chore: scaffold node/ts/vitest project with health endpoint

server/src/app.ts

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+import Fastify, { FastifyInstance } from 'fastify'
+import Database from 'better-sqlite3'
+import type { Config } from './config.js'
+
+declare module 'fastify' {
+  interface FastifyInstance {
+    db: Database.Database
+    config: Config
+    fetchImpl: typeof fetch
+  }
+}
+
+export interface AppOptions {
+  db: Database.Database
+  config: Config
+  fetchImpl?: typeof fetch
+}
+
+export async function buildApp(opts: AppOptions): Promise<FastifyInstance> {
+  const app = Fastify({ logger: false })
+  app.decorate('db', opts.db)
+  app.decorate('config', opts.config)
+  app.decorate('fetchImpl', opts.fetchImpl ?? fetch)
+  app.get('/api/health', async () => ({ ok: true }))
+  return app
+}

server/src/config.ts

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+export interface Config {
+  dataDir: string
+  artworkDir: string
+  dbPath: string
+  port: number
+  sessionSecret: string
+}

server/src/db.ts

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+import Database from 'better-sqlite3'
+
+export type DB = Database.Database
+
+export function openDatabase(path: string): DB {
+  const db = new Database(path)
+  db.pragma('journal_mode = WAL')
+  db.pragma('foreign_keys = ON')
+  return db
+}

server/src/index.ts

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+import { buildApp } from './app.js'
+import { openDatabase } from './db.js'
+import type { Config } from './config.js'
+
+const config: Config = {
+  dataDir: process.env.DATA_DIR ?? 'data',
+  artworkDir: (process.env.DATA_DIR ?? 'data') + '/artwork-cache',
+  dbPath: (process.env.DATA_DIR ?? 'data') + '/record-shop.db',
+  port: Number(process.env.PORT ?? 3000),
+  sessionSecret: 'placeholder-replaced-in-task-3',
+}
+
+const db = openDatabase(config.dbPath)
+const app = await buildApp({ db, config })
+await app.listen({ port: config.port, host: '0.0.0.0' })

server/test/app.test.ts

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+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'
+
+const config: Config = {
+  dataDir: ':memory:',
+  artworkDir: ':memory:',
+  dbPath: ':memory:',
+  port: 0,
+  sessionSecret: 'test-secret-test-secret-test-secret-1234',
+}
+
+describe('GET /api/health', () => {
+  it('returns ok', async () => {
+    const db = openDatabase(':memory:')
+    const app = await buildApp({ db, config })
+    const res = await app.inject({ method: 'GET', url: '/api/health' })
+    expect(res.statusCode).toBe(200)
+    expect(res.json()).toEqual({ ok: true })
+    await app.close()
+  })
+})

server/tsconfig.build.json

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+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": { "outDir": "dist", "rootDir": "src" },
+  "include": ["src/**/*"]
+}

server/tsconfig.json

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+{
+  "extends": "../tsconfig.json",
+  "compilerOptions": { "noEmit": true },
+  "include": ["src/**/*", "test/**/*"]
+}