Implement Indonesian Railway Rolling Stock Management

### Overview
Complete rolling stock management system with Indonesian railway numbering standards, comprehensive CRUD operations, and user-friendly interface

### Key Changes
- **Complete Database Schema**: Implemented 5 new tables for comprehensive rolling stock management
- **Indonesian Railway Standards**: Full support for official PT KAI numbering system (K1, K2, K3, M1, M2, M3, T1, T2, T3, P, SU, SI)
- **Category System**: 11 rolling stock categories including passenger cars, freight cars, special equipment
- **Service Types**: 9 service types covering Executive (K1), Business (K2), Economy (K3), and special services
- **Admin Interface**: Complete CRUD operations with responsive a168 template design
- **Dynamic Forms**: Context-aware forms that adapt based on vehicle category selection
- **Advanced Features**: Statistics dashboard, search/filtering, and comprehensive validation

### Technical Implementation
- **Database Tables**:
- `rolling_stock_categories` - Vehicle type categorization (passenger, freight, special)
- `rolling_stock_service_types` - Service class definitions (K1, K2, K3, etc.)
- `rolling_stock` - Main vehicle data with 30+ attributes
- `rolling_stock_images` - Photo management with R2 cloud storage support
- `rolling_stock_transfers` - Depot movement tracking and history

- **Models & Relationships**:
- Full Eloquent relationships connecting categories, service types, dipos, liveries
- Advanced scopes for filtering by status, category, and service type
- Helper methods for Indonesian number formatting and display
- Comprehensive validation including numbering format checks

- **Controller Features**:
- `RollingStockController` with full CRUD operations
- Dynamic AJAX loading of service types based on category selection
- Advanced search across multiple fields
- Statistics calculations and dashboard metrics
- Form validation with Indonesian railway business rules

- **User Interface**:
- Statistics cards showing vehicle counts by category and status
- Dynamic form fields that appear/hide based on vehicle type
- Category-specific feature toggles (AC, reclining seats, sleeper berths)
- Responsive design using a168 adminuiux components
- Search and filtering with real-time results

### Impact
- **Railway Operations**: Comprehensive digital tracking of all Indonesian railway rolling stock
- **Data Standardization**: Unified system following official PT KAI numbering conventions
- **Operational Efficiency**: Digital depot management and vehicle transfer tracking
- **Maintenance Planning**: Inspection scheduling and condition monitoring capabilities
- **Fleet Management**: Statistical insights and reporting for railway operations
- **Scalability**: Production-ready system supporting thousands of vehicles across Indonesia

### Gambaran Umum
Sistem manajemen rolling stock lengkap dengan standar penomoran kereta api Indonesia, operasi CRUD komprehensif, dan antarmuka yang user-friendly

### Perubahan Utama
- **Skema Database Lengkap**: Mengimplementasikan 5 tabel baru untuk manajemen rolling stock komprehensif
- **Standar Kereta Api Indonesia**: Dukungan penuh untuk sistem penomoran resmi PT KAI (K1, K2, K3, M1, M2, M3, T1, T2, T3, P, SU, SI)
- **Sistem Kategori**: 11 kategori rolling stock termasuk kereta penumpang, kereta barang, peralatan khusus
- **Tipe Layanan**: 9 tipe layanan mencakup Eksekutif (K1), Bisnis (K2), Ekonomi (K3), dan layanan khusus
- **Antarmuka Admin**: Operasi CRUD lengkap dengan desain template a168 yang responsif
- **Form Dinamis**: Form yang menyesuaikan konteks berdasarkan pemilihan kategori kendaraan
- **Fitur Lanjutan**: Dashboard statistik, pencarian/filtering, dan validasi komprehensif

### Implementasi Teknis
- **Tabel Database**:
- `rolling_stock_categories` - Kategorisasi tipe kendaraan (penumpang, barang, khusus)
- `rolling_stock_service_types` - Definisi kelas layanan (K1, K2, K3, dll.)
- `rolling_stock` - Data kendaraan utama dengan 30+ atribut
- `rolling_stock_images` - Manajemen foto dengan dukungan penyimpanan cloud R2
- `rolling_stock_transfers` - Pelacakan perpindahan dan riwayat depo

- **Model & Relasi**:
- Relasi Eloquent lengkap menghubungkan kategori, tipe layanan, depo, livery
- Scope lanjutan untuk filtering berdasarkan status, kategori, dan tipe layanan
- Metode helper untuk format penomoran Indonesia dan tampilan
- Validasi komprehensif termasuk pengecekan format penomoran

- **Fitur Controller**:
- `RollingStockController` dengan operasi CRUD lengkap
- Loading AJAX dinamis tipe layanan berdasarkan pemilihan kategori
- Pencarian lanjutan di beberapa field
- Kalkulasi statistik dan metrik dashboard
- Validasi form dengan aturan bisnis kereta api Indonesia

- **Antarmuka Pengguna**:
- Kartu statistik menampilkan jumlah kendaraan berdasarkan kategori dan status
- Field form dinamis yang muncul/tersembunyi berdasarkan tipe kendaraan
- Toggle fitur spesifik kategori (AC, kursi reclining, tempat tidur)
- Desain responsif menggunakan komponen a168 adminuiux
- Pencarian dan filtering dengan hasil real-time

### Dampak
- **Operasi Kereta Api**: Pelacakan digital komprehensif semua rolling stock kereta api Indonesia
- **Standardisasi Data**: Sistem terpadu mengikuti konvensi penomoran resmi PT KAI
- **Efisiensi Operasional**: Manajemen depo digital dan pelacakan transfer kendaraan
- **Perencanaan Pemeliharaan**: Penjadwalan inspeksi dan kemampuan monitoring kondisi
- **Manajemen Armada**: Wawasan statistik dan pelaporan untuk operasi kereta api
- **Skalabilitas**: Sistem siap produksi mendukung ribuan kendaraan di seluruh Indonesia