fix(web): vite-env.d.ts missing vite/client types reference

import.meta.env (used by main.ts's dev-token auto-config) was untyped
since that landed — vite-env.d.ts never referenced Vite's client types.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

web/src/vite-env.d.ts

@@ -1,2 +1,4 @@
+/// <reference types="vite/client" />
+
 declare const __OIKOS_VERSION__: string
 declare const __OIKOS_DEV_TOKEN__: string