chore(deps): align frontend toolchain on vite 7 and split admin bundle

Upgrade admin-web and desktop-client onto Vite 7 / Vitest 4 with the
matching @vitejs/plugin-vue 6 and electron-vite 5, and introduce
manualChunks plus gzip/brotli compression so the admin bundle ships
in smaller, route-aware pieces. ANALYZE=true emits a treemap via
rollup-plugin-visualizer; the generated stats.html is gitignored.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/admin-web/package.json

@@ -6,6 +6,7 @@
   "scripts": {
     "dev": "vite",
     "build": "vue-tsc --noEmit && vite build",
+    "build:analyze": "vue-tsc --noEmit && ANALYZE=true vite build",
     "preview": "vite preview",
     "typecheck": "vue-tsc --noEmit"
   },
@@ -18,13 +19,13 @@
     "@milkdown/kit": "^7.20.0",
     "@milkdown/theme-nord": "^7.20.0",
     "@milkdown/vue": "^7.20.0",
-    "nanoid": "^5.1.7",
     "@tanstack/vue-query": "^5.96.0",
     "@vueuse/core": "^14.2.1",
     "ant-design-vue": "^4.2.6",
     "dayjs": "^1.11.20",
     "dompurify": "^3.3.3",
     "markdown-it": "^14.1.1",
+    "nanoid": "^5.1.7",
     "pinia": "^3.0.4",
     "vue": "^3.5.31",
     "vue-i18n": "^10.0.5",
@@ -35,8 +36,10 @@
     "@types/markdown-it": "^14.1.2",
     "@types/node": "^24.0.0",
     "@vitejs/plugin-vue": "^6.0.5",
+    "rollup-plugin-visualizer": "^7.0.1",
     "typescript": "^5.9.3",
-    "vite": "^8.0.3",
+    "vite": "^7.3.2",
+    "vite-plugin-compression2": "^2.5.3",
     "vue-tsc": "^3.2.6"
   }
 }