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/src/manifest.json

@@ -7,7 +7,8 @@
   "h5": {
     "title": "光子美容仪后台",
     "router": {
-      "mode": "hash"
+      "mode": "hash",
+      "base": "/admin/"
     }
   }
 }

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()]
 })