Fix API connectivity and import filament data from PDF

- Update all environment files to use new PostgreSQL API endpoint
- Fix CORS configuration in API server
- Import 35 filaments and 29 colors from PDF data
- Fix TypeScript type error in dashboard
- Add back emoji icons for dark mode toggle
- Remove debugging code and test buttons
- Clean up error handling

app/upadaj/colors/page.tsx

@@ -2,8 +2,8 @@
 
 import { useState, useEffect } from 'react';
 import { useRouter } from 'next/navigation';
-import { colorService } from '../../../src/services/api';
-import '../../../src/styles/select.css';
+import { colorService } from '@/src/services/api';
+import '@/src/styles/select.css';
 
 interface Color {
   id: string;
@@ -170,7 +170,7 @@ export default function ColorsManagement() {
                       className="px-4 py-2 bg-gray-200 dark:bg-gray-700 text-gray-800 dark:text-gray-200 rounded hover:bg-gray-300 dark:hover:bg-gray-600 transition-colors"
                       title={darkMode ? 'Svetla tema' : 'Tamna tema'}
                     >
-                      {darkMode ? 'Svetla' : 'Tamna'}
+                      {darkMode ? '☀️' : '🌙'}
                     </button>
                   )}
                   <button