build(vite)!: migrate to Vite 8, switch to Oxc-based @vitejs/plugin-react, and clean up legacy compatibility config (#6492)

* chore(deps): update npm dependencies to v8

* build(vite)!: migrate to Vite 8, switch to Oxc-based @vitejs/plugin-react, and clean up legacy compatibility config

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Slinetrac <realakayuki@gmail.com>

package.json

@@ -91,8 +91,8 @@
     "@types/react": "19.2.14",
     "@types/react-dom": "19.2.3",
     "@types/validator": "^13.15.10",
-    "@vitejs/plugin-legacy": "^7.2.1",
-    "@vitejs/plugin-react-swc": "^4.2.3",
+    "@vitejs/plugin-legacy": "^8.0.0",
+    "@vitejs/plugin-react": "^6.0.0",
     "adm-zip": "^0.5.16",
     "cli-color": "^2.0.4",
     "commander": "^14.0.3",
@@ -119,7 +119,7 @@
     "terser": "^5.46.0",
     "typescript": "^5.9.3",
     "typescript-eslint": "^8.56.1",
-    "vite": "^7.3.1",
+    "vite": "^8.0.0",
     "vite-plugin-svgr": "^4.5.0"
   },
   "lint-staged": {
@@ -136,7 +136,6 @@
   "pnpm": {
     "onlyBuiltDependencies": [
       "@parcel/watcher",
-      "@swc/core",
       "core-js",
       "es5-ext",
       "esbuild",