Refactor Vite configuration and add environment type definitions

- Removed local Vite config file
- Updated dev scripts to use default config
- Added env.d.ts for type definitions
- Enhanced Vite config with dynamic proxy
- Simplified build and dev script commands

lightrag_webui/package.json

@@ -4,11 +4,11 @@
   "version": "0.0.0",
   "type": "module",
   "scripts": {
-    "dev": "bunx --bun vite --config vite.config.local.js",
+    "dev": "bunx --bun vite",
     "build": "bunx --bun vite build",
     "lint": "eslint .",
     "preview": "bunx --bun vite preview",
-    "dev-no-bun": "vite --config vite.config.local.js",
+    "dev-no-bun": "vite",
     "build-no-bun": "vite build --emptyOutDir",
     "preview-no-bun": "vite preview"
   },