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/page.tsx

@@ -2,7 +2,7 @@
 
 import { useState, useEffect } from 'react';
 import { useRouter } from 'next/navigation';
-import { authService } from '../../src/services/api';
+import { authService } from '@/src/services/api';
 
 export default function AdminLogin() {
   const router = useRouter();
@@ -30,7 +30,7 @@ export default function AdminLogin() {
 
       // Redirect to admin dashboard
       router.push('/upadaj/dashboard');
-    } catch (err) {
+    } catch (err: any) {
       setError('Neispravno korisničko ime ili lozinka');
       console.error('Login error:', err);
     } finally {