Migrate from Create React App to Vite

CRA (react-scripts 5.0.1) is abandoned and incompatible with TypeScript 5.x.
Vite provides faster builds, active maintenance, and native TS5 support.

- Replace react-scripts with vite + @vitejs/plugin-react
- Move index.html to root with script module entry point
- Replace setupProxy.js with vite.config.ts proxy config
- Rename env vars from REACT_APP_ to VITE_ prefix
- Update tsconfig for bundler module resolution
- Add nginx setup script for deployment

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/services/dataService.ts

@@ -17,8 +17,8 @@ import type {
   NocoDBDailyStat
 } from '../types';
 
-const NOCODB_URL = process.env.REACT_APP_NOCODB_URL || '';
-const NOCODB_TOKEN = process.env.REACT_APP_NOCODB_TOKEN || '';
+const NOCODB_URL = import.meta.env.VITE_NOCODB_URL || '';
+const NOCODB_TOKEN = import.meta.env.VITE_NOCODB_TOKEN || '';
 
 // Table IDs (Cloudron NocoDB)
 const NOCODB_TABLES = {
@@ -230,7 +230,7 @@ export async function fetchData(): Promise<FetchResult> {
       console.warn('NocoDB not configured, using cached data');
       return { data: cached.data, fromCache: true, cacheTimestamp: cached.timestamp };
     }
-    throw new Error('NocoDB not configured and no cached data available. Set REACT_APP_NOCODB_URL and REACT_APP_NOCODB_TOKEN in .env.local');
+    throw new Error('NocoDB not configured and no cached data available. Set VITE_NOCODB_URL and VITE_NOCODB_TOKEN in .env.local');
   }
   
   try {

src/services/sallaService.ts

@@ -1,7 +1,7 @@
 // Salla Integration Service
 // Connects to the local Salla backend server
 
-const SALLA_SERVER_URL = process.env.REACT_APP_SALLA_SERVER_URL || 'http://localhost:3001';
+const SALLA_SERVER_URL = import.meta.env.VITE_SALLA_SERVER_URL || 'http://localhost:3001';
 
 export interface SallaAuthStatus {
   connected: boolean;