perf(mp): E3-3 构建优化 — 独立分包 + Terser 压缩增强

- 医生端分包(pkg-doctor-core/pkg-doctor-clinical)设 independent:true
  减少主包体积，独立加载不依赖主包
- prod terser 添加 passes:2 + unsafe 压缩 + toplevel mangle
  提升代码压缩率
- base config 添加 miniCssExtractPluginOption ignoreOrder
  消除 CSS 顺序警告

apps/miniprogram/config/index.ts

@@ -48,6 +48,9 @@ export default defineConfig(async (merge) => {
           page.chunks?.unshift('common');
         });
       },
+      miniCssExtractPluginOption: {
+        ignoreOrder: true,
+      },
       postcss: {
         pxtransform: { enable: true, config: {} },
         cssModules: {