feat(mobile-app): add DST network support to deposit page

- Add DST to NetworkType enum
- Add dstAddress field to DepositAddressResponse
- Update deposit_service to fetch and cache DST address
- Add DST network button in deposit page UI

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

frontend/mobile-app/lib/core/services/deposit_service.dart

@@ -7,12 +7,14 @@ import '../storage/storage_keys.dart';
 class DepositAddressResponse {
   final String? kavaAddress;
   final String? bscAddress;
+  final String? dstAddress;
   final bool isValid;
   final String? message;
 
   DepositAddressResponse({
     this.kavaAddress,
     this.bscAddress,
+    this.dstAddress,
     required this.isValid,
     this.message,
   });
@@ -21,6 +23,7 @@ class DepositAddressResponse {
     return DepositAddressResponse(
       kavaAddress: json['kavaAddress'],
       bscAddress: json['bscAddress'],
+      dstAddress: json['dstAddress'],
       isValid: json['isValid'] ?? false,
       message: json['message'],
     );
@@ -96,13 +99,16 @@ class DepositService {
       // 先尝试从本地存储读取
       final kavaAddress = await _secureStorage.read(key: StorageKeys.walletAddressKava);
       final bscAddress = await _secureStorage.read(key: StorageKeys.walletAddressBsc);
+      final dstAddress = await _secureStorage.read(key: StorageKeys.walletAddressDst);
 
       if (kavaAddress != null && kavaAddress.isNotEmpty &&
-          bscAddress != null && bscAddress.isNotEmpty) {
-        debugPrint('从本地存储获取充值地址: kava=$kavaAddress, bsc=$bscAddress');
+          bscAddress != null && bscAddress.isNotEmpty &&
+          dstAddress != null && dstAddress.isNotEmpty) {
+        debugPrint('从本地存储获取充值地址: kava=$kavaAddress, bsc=$bscAddress, dst=$dstAddress');
         return DepositAddressResponse(
           kavaAddress: kavaAddress,
           bscAddress: bscAddress,
+          dstAddress: dstAddress,
           isValid: true,
         );
       }
@@ -120,8 +126,9 @@ class DepositService {
           if (addresses != null) {
             final kava = addresses['kava'] as String?;
             final bsc = addresses['bsc'] as String?;
+            final dst = addresses['dst'] as String?;
 
-            debugPrint('从服务器获取充值地址成功: kava=$kava, bsc=$bsc');
+            debugPrint('从服务器获取充值地址成功: kava=$kava, bsc=$bsc, dst=$dst');
 
             // 保存到本地存储
             if (kava != null && kava.isNotEmpty) {
@@ -130,12 +137,16 @@ class DepositService {
             if (bsc != null && bsc.isNotEmpty) {
               await _secureStorage.write(key: StorageKeys.walletAddressBsc, value: bsc);
             }
+            if (dst != null && dst.isNotEmpty) {
+              await _secureStorage.write(key: StorageKeys.walletAddressDst, value: dst);
+            }
 
             return DepositAddressResponse(
               kavaAddress: kava,
               bscAddress: bsc,
-              isValid: kava != null && bsc != null,
-              message: (kava == null || bsc == null) ? '部分地址未生成' : null,
+              dstAddress: dst,
+              isValid: kava != null && bsc != null && dst != null,
+              message: (kava == null || bsc == null || dst == null) ? '部分地址未生成' : null,
             );
           }
         } else if (data != null && data['status'] == 'generating') {

frontend/mobile-app/lib/features/deposit/presentation/pages/deposit_usdt_page.dart

@@ -9,6 +9,7 @@ import '../../../../core/di/injection_container.dart';
 enum NetworkType {
   kava,
   bsc,
+  dst,
 }
 
 /// 充值 USDT 页面
@@ -36,6 +37,9 @@ class _DepositUsdtPageState extends ConsumerState<DepositUsdtPage> {
   /// BSC 网络充值地址
   String? _bscAddress;
 
+  /// DST 网络充值地址
+  String? _dstAddress;
+
   @override
   void initState() {
     super.initState();
@@ -71,6 +75,7 @@ class _DepositUsdtPageState extends ConsumerState<DepositUsdtPage> {
 
       _kavaAddress = addressResponse.kavaAddress;
       _bscAddress = addressResponse.bscAddress;
+      _dstAddress = addressResponse.dstAddress;
 
       // 查询实时余额
       try {
@@ -115,6 +120,8 @@ class _DepositUsdtPageState extends ConsumerState<DepositUsdtPage> {
         return _kavaAddress ?? '';
       case NetworkType.bsc:
         return _bscAddress ?? '';
+      case NetworkType.dst:
+        return _dstAddress ?? '';
     }
   }
 
@@ -287,7 +294,7 @@ class _DepositUsdtPageState extends ConsumerState<DepositUsdtPage> {
             // KAVA 网络按钮
             Expanded(
               child: _buildNetworkButton(
-                label: 'KAVA 网络',
+                label: 'KAVA',
                 network: NetworkType.kava,
                 isSelected: _selectedNetwork == NetworkType.kava,
               ),
@@ -295,11 +302,19 @@ class _DepositUsdtPageState extends ConsumerState<DepositUsdtPage> {
             // BSC 网络按钮
             Expanded(
               child: _buildNetworkButton(
-                label: 'BSC 网络',
+                label: 'BSC',
                 network: NetworkType.bsc,
                 isSelected: _selectedNetwork == NetworkType.bsc,
               ),
             ),
+            // DST 网络按钮
+            Expanded(
+              child: _buildNetworkButton(
+                label: 'DST',
+                network: NetworkType.dst,
+                isSelected: _selectedNetwork == NetworkType.dst,
+              ),
+            ),
           ],
         ),
       ),