ref(tanstackstart-react): Bump vite devDependency to ^7.0.0

TanStack Start requires Vite 7 as a peer dependency:
https://github.com/TanStack/router/blob/main/packages/react-start/package.json

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: nicohrubec

packages/tanstackstart-react/package.json

@@ -72,7 +72,7 @@
     "@sentry/vite-plugin": "^5.3.0"
   },
   "devDependencies": {
-    "vite": "^5.4.11"
+    "vite": "^7.0.0"
   },
   "scripts": {
     "build": "run-p build:transpile build:types",