feat: 重构充值提现功能，添加冷钱包管理

后端改动：
- 新增冷钱包管理模块（ColdWallet实体、Mapper、Service、Controller）
- 充值流程：创建订单→显示钱包地址→用户确认打款→管理员审核
- 提现流程：用户输入地址和联系方式→冻结余额→管理员审核
- OrderFund新增字段：walletId, walletAddress, withdrawContact, payTime, confirmTime

前端改动（monisuo-admin）：
- 新增冷钱包管理页面（wallets.vue）
- 优化订单管理页面，支持新的状态流转
- 添加调试日志帮助排查登录问题

前端改动（flutter_monisuo）：
- 更新OrderFund模型支持新字段
- 充值成功后显示钱包地址弹窗
- 提现时收集提现地址和联系方式
- 新增资金订单页面

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

flutter_monisuo/lib/ui/pages/home/home_page.dart

@@ -391,9 +391,81 @@ class _HomePageState extends State<HomePage> with AutomaticKeepAliveClientMixin
   }
 
   void _showWithdraw() {
-    _showActionDialog('提现', '请输入提现金额(USDT)', (amount) {
-      context.read<AssetProvider>().withdraw(amount: amount);
-    });
+    final amountController = TextEditingController();
+    final addressController = TextEditingController();
+    final contactController = TextEditingController();
+    final formKey = GlobalKey<ShadFormState>();
+
+    showShadDialog(
+      context: context,
+      builder: (context) => ShadDialog(
+        title: const Text('提现'),
+        child: ShadForm(
+          key: formKey,
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              ShadInputFormField(
+                id: 'amount',
+                placeholder: const Text('请输入提现金额(USDT)'),
+                controller: amountController,
+                keyboardType: const TextInputType.numberWithOptions(decimal: true),
+                validator: (value) {
+                  if (value == null || value.isEmpty) {
+                    return '请输入金额';
+                  }
+                  final amount = double.tryParse(value);
+                  if (amount == null || amount <= 0) {
+                    return '请输入有效金额';
+                  }
+                  return null;
+                },
+              ),
+              const SizedBox(height: 12),
+              ShadInputFormField(
+                id: 'address',
+                placeholder: const Text('请输入提现地址'),
+                controller: addressController,
+                validator: (value) {
+                  if (value == null || value.isEmpty) {
+                    return '请输入提现地址';
+                  }
+                  return null;
+                },
+              ),
+              const SizedBox(height: 12),
+              ShadInputFormField(
+                id: 'contact',
+                placeholder: const Text('联系方式(可选)'),
+                controller: contactController,
+              ),
+            ],
+          ),
+        ),
+        actions: [
+          ShadButton.outline(
+            child: const Text('取消'),
+            onPressed: () => Navigator.of(context).pop(),
+          ),
+          ShadButton(
+            child: const Text('确认'),
+            onPressed: () {
+              if (formKey.currentState!.saveAndValidate()) {
+                final amount = amountController.text.trim();
+                final address = addressController.text.trim();
+                final contact = contactController.text.trim();
+                Navigator.of(context).pop();
+                context.read<AssetProvider>().withdraw(
+                  amount: amount,
+                  withdrawAddress: address,
+                  withdrawContact: contact.isEmpty ? null : contact,
+                );
+              }
+            },
+          ),
+        ],
+      ),
+    );
   }
 
   void _showTransfer() {