fix(frontend): 完善表单校验并添加错误提示

- UserEditModal: 添加 email 必填和 concurrency 最小值校验
- UserAttributesConfigModal: 添加 key/name 必填和 options 非空校验
- GroupsView: 添加 name 必填校验
- ProxiesView: 添加 name/host 必填和 port 范围校验
- UserBalanceModal: 添加 amount 有效性和余额充足性校验
- RedeemView: 添加空兑换码错误提示
- i18n: 添加所有新增校验的中英文翻译

frontend/src/i18n/locales/en.ts

@@ -462,7 +462,8 @@ export default {
     days: ' days',
     codeRedeemSuccess: 'Code redeemed successfully!',
     failedToRedeem: 'Failed to redeem code. Please check the code and try again.',
-    subscriptionRefreshFailed: 'Redeemed successfully, but failed to refresh subscription status.'
+    subscriptionRefreshFailed: 'Redeemed successfully, but failed to refresh subscription status.',
+    pleaseEnterCode: 'Please enter a redeem code'
   },
 
   // Profile
@@ -658,6 +659,10 @@ export default {
       failedToDelete: 'Failed to delete user',
       failedToToggle: 'Failed to update user status',
       failedToLoadApiKeys: 'Failed to load user API keys',
+      emailRequired: 'Please enter email',
+      concurrencyMin: 'Concurrency must be at least 1',
+      amountRequired: 'Please enter a valid amount',
+      insufficientBalance: 'Insufficient balance',
       deleteConfirm: "Are you sure you want to delete '{email}'? This action cannot be undone.",
       setAllowedGroups: 'Set Allowed Groups',
       allowedGroupsHint:
@@ -689,7 +694,6 @@ export default {
       failedToDeposit: 'Failed to deposit',
       failedToWithdraw: 'Failed to withdraw',
       useDepositWithdrawButtons: 'Please use deposit/withdraw buttons to adjust balance',
-      insufficientBalance: 'Insufficient balance, balance cannot be negative after withdrawal',
       roles: {
         admin: 'Admin',
         user: 'User'
@@ -749,6 +753,9 @@ export default {
         failedToLoad: 'Failed to load attributes',
         failedToCreate: 'Failed to create attribute',
         failedToUpdate: 'Failed to update attribute',
+        keyRequired: 'Please enter attribute key',
+        nameRequired: 'Please enter display name',
+        optionsRequired: 'Please add at least one option',
         failedToDelete: 'Failed to delete attribute',
         failedToReorder: 'Failed to update order',
         keyExists: 'Attribute key already exists',
@@ -816,6 +823,7 @@ export default {
       failedToCreate: 'Failed to create group',
       failedToUpdate: 'Failed to update group',
       failedToDelete: 'Failed to delete group',
+      nameRequired: 'Please enter group name',
       platforms: {
         all: 'All Platforms',
         anthropic: 'Anthropic',
@@ -1584,6 +1592,9 @@ export default {
       failedToUpdate: 'Failed to update proxy',
       failedToDelete: 'Failed to delete proxy',
       failedToTest: 'Failed to test proxy',
+      nameRequired: 'Please enter proxy name',
+      hostRequired: 'Please enter host address',
+      portInvalid: 'Port must be between 1-65535',
       deleteConfirm:
         "Are you sure you want to delete '{name}'? Accounts using this proxy will have their proxy removed."
     },

frontend/src/i18n/locales/zh.ts

@@ -459,7 +459,8 @@ export default {
     days: '天',
     codeRedeemSuccess: '兑换成功！',
     failedToRedeem: '兑换失败，请检查兑换码后重试。',
-    subscriptionRefreshFailed: '兑换成功，但订阅状态刷新失败。'
+    subscriptionRefreshFailed: '兑换成功，但订阅状态刷新失败。',
+    pleaseEnterCode: '请输入兑换码'
   },
 
   // Profile
@@ -716,6 +717,10 @@ export default {
       concurrencyAdjustedSuccess: '并发数调整成功',
       failedToSave: '保存用户失败',
       failedToAdjust: '调整失败',
+      emailRequired: '请输入邮箱',
+      concurrencyMin: '并发数不能小于1',
+      amountRequired: '请输入有效金额',
+      insufficientBalance: '余额不足',
       setAllowedGroups: '设置允许分组',
       allowedGroupsHint: '选择此用户可以使用的标准分组。订阅类型分组请在订阅管理中配置。',
       noStandardGroups: '暂无标准分组',
@@ -742,7 +747,6 @@ export default {
       failedToDeposit: '充值失败',
       failedToWithdraw: '退款失败',
       useDepositWithdrawButtons: '请使用充值/退款按钮调整余额',
-      insufficientBalance: '余额不足，退款后余额不能为负数',
       // Settings Dropdowns
       filterSettings: '筛选设置',
       columnSettings: '列设置',
@@ -798,6 +802,9 @@ export default {
         failedToLoad: '加载属性列表失败',
         failedToCreate: '创建属性失败',
         failedToUpdate: '更新属性失败',
+        keyRequired: '请输入属性键',
+        nameRequired: '请输入显示名称',
+        optionsRequired: '请至少添加一个选项',
         failedToDelete: '删除属性失败',
         failedToReorder: '更新排序失败',
         keyExists: '属性键已存在',
@@ -905,6 +912,7 @@ export default {
       groupDeleted: '分组删除成功',
       failedToCreate: '创建分组失败',
       failedToUpdate: '更新分组失败',
+      nameRequired: '请输入分组名称',
       subscription: {
         title: '订阅设置',
         type: '计费类型',
@@ -1694,6 +1702,9 @@ export default {
       failedToCreate: '创建代理失败',
       failedToUpdate: '更新代理失败',
       failedToTest: '测试代理失败',
+      nameRequired: '请输入代理名称',
+      hostRequired: '请输入主机地址',
+      portInvalid: '端口必须在 1-65535 之间',
       deleteConfirm: "确定要删除代理 '{name}' 吗？使用此代理的账号将被移除代理设置。"
     },