feat(cli): 引入 citty CLI，迁移改为显式 ./server migrate

- 顶层新增 bin.ts 作为编译入口，citty 懒加载 src/cli/ 下子命令
- src/cli/serve.ts 通过 _serve-nitro.mjs 桥接启动 Nitro（规避
  .output/server/index.mjs 顶层 serve(...) 的副作用导入）
- src/cli/migrate.ts 显式跑 drizzle migrate；env / drizzle 都在 run()
  里 await import，避免 citty --help 遍历 subCommands 时触发 env 校验
- compile.ts 入口切到 bin.ts；移除 src/server/plugins/migrate.ts
  与 vite.config.ts 中的启动时自动迁移
- compose.yaml 新增一次性 migrate 服务，app depends_on
  service_completed_successfully，保证迁移先行再起服
- tsconfig 排除 .output / out；AGENTS.md 补充 CLI 与部署规约

src/cli/_serve-nitro.d.mts

@@ -0,0 +1 @@
+export default function startNitroServer(): Promise<void>

src/cli/_serve-nitro.mjs

@@ -0,0 +1,3 @@
+export default async function startNitroServer() {
+  await import('../../.output/server/index.mjs')
+}

src/cli/migrate.ts

@@ -0,0 +1,32 @@
+import { existsSync } from 'node:fs'
+import { defineCommand } from 'citty'
+
+const MIGRATIONS_FOLDER = './drizzle'
+
+export default defineCommand({
+  meta: {
+    name: 'migrate',
+    description: 'Apply pending database migrations from ./drizzle',
+  },
+  async run() {
+    if (!existsSync(MIGRATIONS_FOLDER)) {
+      console.log(`No ${MIGRATIONS_FOLDER} directory; nothing to apply (use db:push in dev).`)
+      return
+    }
+
+    const [{ env }, { drizzle }, { migrate }] = await Promise.all([
+      import('@/env'),
+      import('drizzle-orm/postgres-js'),
+      import('drizzle-orm/postgres-js/migrator'),
+    ])
+
+    const db = drizzle({ connection: { url: env.DATABASE_URL, max: 1 } })
+    try {
+      console.log('Applying migrations...')
+      await migrate(db, { migrationsFolder: MIGRATIONS_FOLDER })
+      console.log('Migrations applied.')
+    } finally {
+      await db.$client.end()
+    }
+  },
+})

src/cli/serve.ts

@@ -0,0 +1,12 @@
+import { defineCommand } from 'citty'
+
+export default defineCommand({
+  meta: {
+    name: 'serve',
+    description: 'Start the HTTP server',
+  },
+  async run() {
+    const { default: startNitroServer } = await import('./_serve-nitro.mjs')
+    await startNitroServer()
+  },
+})

src/server/plugins/migrate.ts

@@ -1,17 +0,0 @@
-import { drizzle } from 'drizzle-orm/postgres-js'
-import { migrate } from 'drizzle-orm/postgres-js/migrator'
-import { env } from '@/env'
-
-export default async () => {
-  if (import.meta.dev) return
-
-  const db = drizzle({ connection: { url: env.DATABASE_URL, max: 1 } })
-
-  try {
-    console.log('Applying migrations...')
-    await migrate(db, { migrationsFolder: './drizzle' })
-    console.log('Migrations applied successfully.')
-  } finally {
-    await db.$client.end()
-  }
-}