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/components/admin/user/UserBalanceModal.vue

@@ -37,10 +37,21 @@ watch(() => props.show, (v) => { if(v) { form.amount = 0; form.notes = '' } })
 
 const calculateNewBalance = () => (props.user ? (props.operation === 'add' ? props.user.balance + form.amount : props.user.balance - form.amount) : 0)
 const handleBalanceSubmit = async () => {
-  if (!props.user) return; submitting.value = true
+  if (!props.user) return
+  if (!form.amount || form.amount <= 0) {
+    appStore.showError(t('admin.users.amountRequired'))
+    return
+  }
+  if (props.operation === 'subtract' && form.amount > props.user.balance) {
+    appStore.showError(t('admin.users.insufficientBalance'))
+    return
+  }
+  submitting.value = true
   try {
     await adminAPI.users.updateBalance(props.user.id, form.amount, props.operation, form.notes)
     appStore.showSuccess(t('common.success')); emit('success'); emit('close')
-  } catch {} finally { submitting.value = false }
+  } catch (e: any) {
+    appStore.showError(e.response?.data?.detail || t('common.error'))
+  } finally { submitting.value = false }
 }
 </script>

frontend/src/components/admin/user/UserEditModal.vue

@@ -86,6 +86,14 @@ const copyPassword = async () => {
 }
 const handleUpdateUser = async () => {
   if (!props.user) return
+  if (!form.email.trim()) {
+    appStore.showError(t('admin.users.emailRequired'))
+    return
+  }
+  if (form.concurrency < 1) {
+    appStore.showError(t('admin.users.concurrencyMin'))
+    return
+  }
   submitting.value = true
   try {
     const data: any = { email: form.email, username: form.username, notes: form.notes, concurrency: form.concurrency }

frontend/src/components/user/UserAttributesConfigModal.vue

@@ -344,6 +344,18 @@ const removeOption = (index: number) => {
 }
 
 const handleSave = async () => {
+  if (!form.key.trim()) {
+    appStore.showError(t('admin.users.attributes.keyRequired'))
+    return
+  }
+  if (!form.name.trim()) {
+    appStore.showError(t('admin.users.attributes.nameRequired'))
+    return
+  }
+  if ((form.type === 'select' || form.type === 'multi_select') && form.options.length === 0) {
+    appStore.showError(t('admin.users.attributes.optionsRequired'))
+    return
+  }
   saving.value = true
   try {
     const data = {

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。"
     },
 

frontend/src/views/admin/GroupsView.vue

@@ -871,6 +871,10 @@ const closeCreateModal = () => {
 }
 
 const handleCreateGroup = async () => {
+  if (!createForm.name.trim()) {
+    appStore.showError(t('admin.groups.nameRequired'))
+    return
+  }
   submitting.value = true
   try {
     await adminAPI.groups.create(createForm)
@@ -912,6 +916,10 @@ const closeEditModal = () => {
 
 const handleUpdateGroup = async () => {
   if (!editingGroup.value) return
+  if (!editForm.name.trim()) {
+    appStore.showError(t('admin.groups.nameRequired'))
+    return
+  }
 
   submitting.value = true
   try {

frontend/src/views/admin/ProxiesView.vue

@@ -887,6 +887,18 @@ const handleBatchCreate = async () => {
 }
 
 const handleCreateProxy = async () => {
+  if (!createForm.name.trim()) {
+    appStore.showError(t('admin.proxies.nameRequired'))
+    return
+  }
+  if (!createForm.host.trim()) {
+    appStore.showError(t('admin.proxies.hostRequired'))
+    return
+  }
+  if (createForm.port < 1 || createForm.port > 65535) {
+    appStore.showError(t('admin.proxies.portInvalid'))
+    return
+  }
   submitting.value = true
   try {
     await adminAPI.proxies.create({
@@ -927,6 +939,18 @@ const closeEditModal = () => {
 
 const handleUpdateProxy = async () => {
   if (!editingProxy.value) return
+  if (!editForm.name.trim()) {
+    appStore.showError(t('admin.proxies.nameRequired'))
+    return
+  }
+  if (!editForm.host.trim()) {
+    appStore.showError(t('admin.proxies.hostRequired'))
+    return
+  }
+  if (editForm.port < 1 || editForm.port > 65535) {
+    appStore.showError(t('admin.proxies.portInvalid'))
+    return
+  }
 
   submitting.value = true
   try {

frontend/src/views/user/RedeemView.vue

@@ -531,6 +531,7 @@ const fetchHistory = async () => {
 
 const handleRedeem = async () => {
   if (!redeemCode.value.trim()) {
+    appStore.showError(t('redeem.pleaseEnterCode'))
     return
   }