feat: improve admin build (#14485)

#### PR Dependency Tree


* **PR #14485** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
  * Admin static assets now served under /admin for self-hosted installs
  * CLI is directly executable from the command line
  * Build tooling supports a configurable self-hosted public path
  * Updated admin package script for adding UI components
* Added a PostCSS dependency and plugin to the build toolchain for admin
builds

* **Style**
* Switched queue module to a local queuedash stylesheet, added queuedash
Tailwind layer, and scoped queuedash styles for the admin UI

* **Bug Fixes**
  * Improved error propagation in the Electron renderer
* Migration compatibility to repair a legacy checksum during native
storage upgrades

* **Tests**
  * Added tests covering the migration repair flow
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

tools/cli/src/bundle.ts

@@ -88,7 +88,11 @@ function getWebpackBundleConfigs(pkg: Package): webpack.MultiConfiguration {
   switch (pkg.name) {
     case '@affine/admin': {
       return [
-        createWebpackHTMLTargetConfig(pkg, pkg.srcPath.join('index.tsx').value),
+        createWebpackHTMLTargetConfig(
+          pkg,
+          pkg.srcPath.join('index.tsx').value,
+          { selfhostPublicPath: '/admin/' }
+        ),
       ] as webpack.MultiConfiguration;
     }
     case '@affine/web':
@@ -158,7 +162,9 @@ function getRspackBundleConfigs(pkg: Package): MultiRspackOptions {
   switch (pkg.name) {
     case '@affine/admin': {
       return [
-        createRspackHTMLTargetConfig(pkg, pkg.srcPath.join('index.tsx').value),
+        createRspackHTMLTargetConfig(pkg, pkg.srcPath.join('index.tsx').value, {
+          selfhostPublicPath: '/admin/',
+        }),
       ] as MultiRspackOptions;
     }
     case '@affine/web':