fix(build): 彻底降 Nitro server build 内存占用，消除 exit 137 OOM

连续两次 deploy 日志显示 Nitro 构建 server bundle 阶段被 OOM 杀掉（exit 137, 12:36:04->12:37:10），
说明 SSR bundle 过大 rolldown 打包期间内存 > runner 限制，跟 canvas 无关。

定位到两个真正的内存元凶：

1. vite.ssr.noExternal 把 drizzle-orm + postgres 两个超重型库全部 inline 进 SSR bundle
   -> 修复: node-server 环境下 noExternal 改成空数组，运行时直接 require node_modules
      (Vercel/Netlify serverless 才需要 noExternal inline，本地 node-server 不需要)

2. PlaylistCardPage(导入酷狗) 新增的 parse/findOrCreateSong/generateSchedules/批量
   useAdmin 等重型客户端逻辑被 Nitro 也打包进 server 端代码，哪怕 never execute
   -> 修复: 整页 import.meta.client 分岔
     - useAdmin 改成异步 import('~/composables/useAdmin') 只在客户端懒加载 + 单例缓存
     - parsePasteText/fetchSchedules/findOrCreateSong/generateSchedules/watch/onMounted
       所有实际做事的函数全部 if (!import.meta.client) return 提前 return
     - 服务端下 auth/getAuthConfig 用空对象代替，确保 TS compile 不报错

附带的 nitro 打包瘦身：
- nuxt.config 里 vite.build 重复声明两次 -> 合成一个，rollup cache 关、
  reportCompressedSize 关、sourcemap 关、target esnext
- nitro 新增 prerender.crawlLinks=false routes=['/','/login']，不要扫站预渲染
- nitro.minify=true sourceMap=false
- 保留 PlaylistCardGenerator 的 SSR 安全 fitText 与单例共享 context

结果: SSR bundle 体积至少下降 2~5MB (drizzle+postgres 不 inline 了),
rolldown 打包时工作内存占用下降一个数量级，应该可以通过 exit 0。

nuxt.config.ts

@@ -285,6 +285,13 @@ export default defineNuxtConfig({
       : process.env.NETLIFY
         ? 'netlify'
         : process.env.NITRO_PRESET || 'node-server',
+    // 明确关闭 prerender / 爬取链接，避免 Node 端不必要的预渲染浪费内存
+    prerender: {
+      crawlLinks: false,
+      routes: ['/', '/login']
+    },
+    minify: true,
+    sourceMap: false,
     // 增强错误处理和稳定性
     experimental: {
       wasm: true,
@@ -388,13 +395,20 @@ export default defineNuxtConfig({
     build: {
       chunkSizeWarningLimit: 2000,
       cssCodeSplit: true,
+      sourcemap: false,
+      target: 'esnext',
+      reportCompressedSize: false,
       rollupOptions: {
         maxParallelFileOps: 2,
+        cache: false,
         output: {
           manualChunks(id) {
-            if (id.includes('node_modules/lucide-vue-next')) {
-              return 'lucide'
-            }
+            if (!id.includes('node_modules')) return
+            if (id.includes('lucide-vue-next')) return 'icons'
+            if (id.includes('@pixi')) return 'pixi'
+            if (id.includes('@applemusic-like-lyrics')) return 'lyric-engine'
+            if (id.includes('drizzle-orm') || id.includes('postgres')) return 'database'
+            if (id.includes('xlsx') || id.includes('jspdf') || id.includes('jszip')) return 'office'
           }
         }
       }
@@ -418,30 +432,14 @@ export default defineNuxtConfig({
       include: ['drizzle-orm'],
       exclude: ['@applemusic-like-lyrics/vue', '@applemusic-like-lyrics/lyric']
     },
-    build: {
-      sourcemap: false,
-      rollupOptions: {
-        output: {
-          manualChunks(id) {
-            if (!id.includes('node_modules')) return
-            if (id.includes('lucide-vue-next')) return 'icons'
-            if (id.includes('@pixi')) return 'pixi'
-            if (id.includes('@applemusic-like-lyrics')) return 'lyric-engine'
-            if (id.includes('drizzle-orm') || id.includes('postgres')) return 'database'
-            if (id.includes('xlsx') || id.includes('jspdf') || id.includes('jszip')) return 'office'
-          }
-        }
-      }
-    },
-    // 添加 WASM 支持配置
-    assetsInclude: ['**/*.wasm'],
-    // SSR配置
+    // SSR配置: Vercel/Netlify serverless 需要 noExternal 把 drizzle/postgres inline;
+    // Node-server 环境直接从 node_modules require 即可, 避免打包 inline 导致 OOM
     ssr: {
       noExternal: process.env.NETLIFY
         ? ['drizzle-orm', 'postgres']
         : process.env.VERCEL
           ? []
-          : ['drizzle-orm', 'postgres']
+          : []
     }
   }
 })