Refactor code and update environment type definitions.

- Consolidate type definitions in vite-env.d.ts
- Update TypeScript include paths

lightrag_webui/tsconfig.json

@@ -26,5 +26,5 @@
       "@/*": ["./src/*"]
     }
   },
-  "include": ["src"]
+  "include": ["src", "vite.config.ts"]
 }