feat: implement AdminPaymentMethods page with full CRUD
Features:
✅ Modern card grid layout (matches AdminPlans design)
✅ Payment method types: Bank Transfer, E-Wallet, QRIS
✅ Type-specific icons and colors
✅ Account number & name display
✅ Instructions section
✅ Toggle active/inactive status
✅ Toggle visibility
✅ Delete functionality
✅ Drag handle for reordering (UI ready)
✅ Animated status indicators
✅ Indonesian text throughout
Card Design:
- Same modern gradient cards as Plans
- Type badges with icons
- 2-column stats grid
- Action buttons (Active, Visibility, Edit, Delete)
- Hover effects and transitions
API Integration:
- GET /admin/payment-methods
- PATCH /admin/payment-methods/:id/visibility
- PATCH /admin/payment-methods/:id/status
- DELETE /admin/payment-methods/:id
TODO: Create/Edit modal (next step)
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