fix(ui): 将所有英文文字改为中文

- 'Amount to Transfer' → '充值金额'
- 'Withdrawal Amount' → '提现金额'
- 'Enter withdrawal amount (USDT)' → '请输入提现金额(USDT)'
- 'Destination Address' → '目标地址'
- 'Enter withdrawal address' → '请输入提现地址'
- 'Contact Info (Optional)' → '联系方式(可选)'
- 'Contact info' → '联系方式'

确保所有 UI 文字都使用中文

flutter_monisuo/lib/ui/pages/asset/asset_page.dart

@@ -526,7 +526,7 @@ void _showDepositDialog(BuildContext context) {
               child: ShadInputFormField(
                 id: 'amount',
                 controller: amountController,
-                label: const Text('Amount to Transfer'),
+                label: const Text('充值金额'),
                 placeholder: const Text('0.00'),
                 keyboardType: const TextInputType.numberWithOptions(decimal: true),
                 validator: Validators.amount,
@@ -885,8 +885,8 @@ void _showWithdrawDialog(BuildContext context, String? balance) {
                     ShadInputFormField(
                       id: 'amount',
                       controller: amountController,
-                      label: const Text('Withdrawal Amount'),
+                      label: const Text('提现金额'),
-                      placeholder: const Text('Enter withdrawal amount (USDT)'),
+                      placeholder: const Text('请输入提现金额(USDT)'),
                       keyboardType: const TextInputType.numberWithOptions(decimal: true),
                       validator: Validators.amount,
                     ),
@@ -894,16 +894,16 @@ void _showWithdrawDialog(BuildContext context, String? balance) {
                     ShadInputFormField(
                       id: 'address',
                       controller: addressController,
-                      label: const Text('Destination Address'),
+                      label: const Text('目标地址'),
-                      placeholder: const Text('Enter withdrawal address'),
+                      placeholder: const Text('请输入提现地址'),
                       validator: (v) => Validators.required(v, '提现地址'),
                     ),
                     SizedBox(height: AppSpacing.md),
                     ShadInputFormField(
                       id: 'contact',
                       controller: contactController,
-                      label: const Text('Contact Info (Optional)'),
+                      label: const Text('联系方式(可选)'),
-                      placeholder: const Text('Contact info'),
+                      placeholder: const Text('联系方式'),
                     ),
                   ],
                 ),