EnakPoint & EnakCoin wallet, PIN, outlet, order, community, reward

- Wallet EnakPoint & EnakCoin: beranda, riwayat, saldo kedaluwarsa, kode
  bayar, tukar EnakCoin, transfer
- PIN (buat, ganti, lupa), outlet, riwayat order, game spin
- Halaman community, webview, coming soon, dan ikon menu beranda baru
- Redesign Reward Saya: kartu tiket, filter chip, detail kode + QR
- Hapus customer point loader, menu, dan checkout lama
- Base URL ke enaklo-pos-api.altru.id

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lib/common/function/app_function.dart

@@ -1,3 +1,5 @@
+import 'dart:math';
+
 import 'package:flutter/material.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
@@ -18,6 +20,18 @@ String getNormalizePhone(String phoneNumber) {
   return '62$normalizedPhone';
 }
 
+/// UUID v4 acak dari [Random.secure], dipakai sebagai `Idempotency-Key`
+/// dan `device_id`.
+String generateUuidV4() {
+  final random = Random.secure();
+  final bytes = List<int>.generate(16, (_) => random.nextInt(256));
+  bytes[6] = (bytes[6] & 0x0f) | 0x40;
+  bytes[8] = (bytes[8] & 0x3f) | 0x80;
+  final hex = bytes.map((b) => b.toRadixString(16).padLeft(2, '0')).join();
+  return '${hex.substring(0, 8)}-${hex.substring(8, 12)}-'
+      '${hex.substring(12, 16)}-${hex.substring(16, 20)}-${hex.substring(20)}';
+}
+
 Map<String, dynamic> getAuthorizationHeader() {
   return {
     'Authorization':