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/src/app.config.ts

@@ -18,6 +18,7 @@ export default defineAppConfig({
     },
     {
       root: 'pages/pkg-doctor-core',
+      independent: true,
       pages: [
         'index', 'patients/index', 'patients/detail/index',
         'consultation/index', 'consultation/detail/index',
@@ -27,6 +28,7 @@ export default defineAppConfig({
     },
     {
       root: 'pages/pkg-doctor-clinical',
+      independent: true,
       pages: [
         'dialysis/index', 'dialysis/detail/index', 'dialysis/create/index',
         'prescription/index', 'prescription/detail/index', 'prescription/create/index',