Upgrade to Vite 8 (#7184)

* Upgrade to Vite 8

* Add release notes

* PR feedback

* [autofix.ci] apply automated fixes

* PR feedback

* fix: inject process.env

* Restore deleted release note

* Clean up and typecheck

* Fix dev server

* Fix type error

* Fix tests

* PR feedback

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

packages/api/package.json

@@ -26,10 +26,10 @@
     "@typescript/native-preview": "^7.0.0-dev.20260309.1",
     "rollup-plugin-visualizer": "^6.0.5",
     "typescript-strict-plugin": "^2.4.4",
-    "vite": "^7.3.1",
+    "vite": "^8.0.0",
     "vite-plugin-dts": "^4.5.4",
     "vite-plugin-peggy-loader": "^2.0.1",
-    "vitest": "^4.0.18"
+    "vitest": "^4.1.0"
   },
   "engines": {
     "node": ">=20"