fix: admin console support non-root path deployment

- Set vite base to /admin/ (configurable via PUBLIC_PATH env var)
- Add h5 router base in manifest.json for subdirectory deployment

admin-console/vite.config.js

@@ -2,5 +2,6 @@ import { defineConfig } from 'vite'
 import uni from '@dcloudio/vite-plugin-uni'
 
 export default defineConfig({
+  base: process.env.PUBLIC_PATH || '/admin/',
   plugins: [uni()]
 })