Enhance payment upload with client-side progress and Indonesian feedback

### Overview
Implemented AJAX file upload with real-time progress tracking and comprehensive Indonesian language user feedback for better payment experience

### Key Changes
- [Add detailed changes here]

### Technical Implementation
- [Add technical details here]

### Impact
- [Add impact assessment here]

### Gambaran Umum
[Indonesian translation of description]

### Perubahan Utama
- [Tambahkan perubahan detail di sini]

### Implementasi Teknis
- [Tambahkan detail teknis di sini]

### Dampak
- [Tambahkan penilaian dampak di sini]