fix(mobile-app): 修复 deposit_usdt_page 中未定义的 _loadWalletData 方法

将错误的方法名 _loadWalletData 改为正确的 _loadData

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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

@@ -310,7 +310,7 @@ class _DepositUsdtPageState extends ConsumerState<DepositUsdtPage> {
                 ),
                 const SizedBox(height: 8),
                 GestureDetector(
-                  onTap: _loadWalletData,
+                  onTap: _loadData,
                   child: const Text(
                     '点击重试',
                     style: TextStyle(