feat: Complete Dashboard API Integration with Analytics Controller

✨ Features:
- Implemented API integration for all 7 dashboard pages
- Added Analytics REST API controller with 7 endpoints
- Full loading and error states with retry functionality
- Seamless dummy data toggle for development

📊 Dashboard Pages:
- Customers Analytics (complete)
- Revenue Analytics (complete)
- Orders Analytics (complete)
- Products Analytics (complete)
- Coupons Analytics (complete)
- Taxes Analytics (complete)
- Dashboard Overview (complete)

🔌 Backend:
- Created AnalyticsController.php with REST endpoints
- All endpoints return 501 (Not Implemented) for now
- Ready for HPOS-based implementation
- Proper permission checks

🎨 Frontend:
- useAnalytics hook for data fetching
- React Query caching
- ErrorCard with retry functionality
- TypeScript type safety
- Zero build errors

📝 Documentation:
- DASHBOARD_API_IMPLEMENTATION.md guide
- Backend implementation roadmap
- Testing strategy

🔧 Build:
- All pages compile successfully
- Production-ready with dummy data fallback
- Zero TypeScript errors

admin-spa/vite.config.ts

@@ -0,0 +1,29 @@
+import react from '@vitejs/plugin-react';
+import { defineConfig } from 'vite';
+import fs from 'node:fs';
+import path from 'node:path';
+
+const key = fs.readFileSync(path.resolve(__dirname, '.cert/woonoow.local-key.pem'));
+const cert = fs.readFileSync(path.resolve(__dirname, '.cert/woonoow.local-cert.pem'));
+
+export default defineConfig({
+  plugins: [react()],
+  resolve: { alias: { '@': path.resolve(__dirname, './src') } },
+  server: {
+    host: 'woonoow.local',
+    port: 5173,
+    strictPort: true,
+    https: { key, cert },
+    cors: true,
+    origin: 'https://woonoow.local:5173',
+    hmr: { protocol: 'wss', host: 'woonoow.local', port: 5173 }
+  },
+  build: {
+    outDir: 'dist',
+    emptyOutDir: true,
+    rollupOptions: {
+      input: { app: 'src/main.tsx' },
+      output: { entryFileNames: 'app.js', assetFileNames: 'app.[ext]' }
+    }
+  }
+});