diff --git a/backend/.env.example b/backend/.env.example
index 99ac588..f5e92c6 100644
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -16,3 +16,6 @@ PORT=8080
 ADMIN_USERNAME=admin
 ADMIN_EMAIL=admin@example.com
 ADMIN_PASSWORD=admin123
+
+# API Token (用于外部 API 调用，可选)
+API_TOKEN=your-api-token-here
diff --git a/backend/internal/middleware/auth_middleware.go b/backend/internal/middleware/auth_middleware.go
index 0ff76f1..5646b31 100644
--- a/backend/internal/middleware/auth_middleware.go
+++ b/backend/internal/middleware/auth_middleware.go
@@ -3,6 +3,7 @@ package middleware
 import (
 	"context"
 	"net/http"
+	"os"
 	"strings"
 
 	"gpt-manager-go/internal/auth"
@@ -31,7 +32,21 @@ func AuthMiddleware(next http.Handler) http.Handler {
 
 		tokenString := parts[1]
 
-		// 解析 Token
+		// 首先检查是否是 API Token
+		apiToken := os.Getenv("API_TOKEN")
+		if apiToken != "" && tokenString == apiToken {
+			// API Token 认证成功，创建虚拟管理员上下文
+			claims := &auth.Claims{
+				UserID:       0,
+				Username:     "api_token",
+				IsSuperAdmin: true,
+			}
+			ctx := context.WithValue(r.Context(), UserContextKey, claims)
+			next.ServeHTTP(w, r.WithContext(ctx))
+			return
+		}
+
+		// 解析 JWT Token
 		claims, err := auth.ParseToken(tokenString)
 		if err != nil {
 			http.Error(w, `{"success":false,"message":"Invalid or expired token"}`, http.StatusUnauthorized)
diff --git a/frontend/src/api/invite.ts b/frontend/src/api/invite.ts
index 546bf9b..0cd6f77 100644
--- a/frontend/src/api/invite.ts
+++ b/frontend/src/api/invite.ts
@@ -37,3 +37,20 @@ export function listInvitations(accountId: number) {
 export function deleteInvite(data: DeleteInviteRequest) {
     return request.delete('/api/invite', { data })
 }
+
+export interface AdminInviteRequest {
+    email: string
+    account_id: number
+}
+
+export interface AdminInviteResponse {
+    success: boolean
+    message?: string
+    invitation_id?: number
+    account_name?: string
+}
+
+export function inviteByAdmin(data: AdminInviteRequest) {
+    return request.post<AdminInviteResponse>('/api/invite', data)
+}
+
diff --git a/frontend/src/stores/accounts.ts b/frontend/src/stores/accounts.ts
index 5633a80..c6d36e6 100644
--- a/frontend/src/stores/accounts.ts
+++ b/frontend/src/stores/accounts.ts
@@ -19,8 +19,8 @@ export const useAccountsStore = defineStore('accounts', () => {
         error.value = null
         try {
             const response = await getAccounts()
-            if (response.data.success && response.data.data) {
-                accounts.value = response.data.data
+            if (response.data.success) {
+                accounts.value = response.data.data || []
             } else {
                 throw new Error(response.data.message || '获取账号列表失败')
             }
diff --git a/frontend/src/views/admin/CardKeysPage.vue b/frontend/src/views/admin/CardKeysPage.vue
index 32fc063..c8d9280 100644
--- a/frontend/src/views/admin/CardKeysPage.vue
+++ b/frontend/src/views/admin/CardKeysPage.vue
@@ -116,8 +116,8 @@ async function loadCardKeys() {
   loading.value = true
   try {
     const response = await getCardKeys({ page: currentPage.value, page_size: pageSize.value })
-    if (response.data.success && response.data.keys) {
-      cardKeys.value = response.data.keys
+    if (response.data.success) {
+      cardKeys.value = response.data.keys || []
       total.value = response.data.total || 0
     } else {
       toast.error(response.data.message || '获取卡密列表失败')
diff --git a/frontend/src/views/admin/TeamsPage.vue b/frontend/src/views/admin/TeamsPage.vue
index 3c58711..941bb57 100644
--- a/frontend/src/views/admin/TeamsPage.vue
+++ b/frontend/src/views/admin/TeamsPage.vue
@@ -54,7 +54,8 @@ import {
 } from '@/components/ui/pagination'
 import { useAccountsStore } from '@/stores/accounts'
 import { createAccount, refreshAccount, deleteAccount, type Account } from '@/api/accounts'
-import { Plus, RefreshCw, Users, Loader2, Eye, EyeOff, Trash2 } from 'lucide-vue-next'
+import { inviteByAdmin } from '@/api/invite'
+import { Plus, RefreshCw, Users, Loader2, Eye, EyeOff, Trash2, UserPlus, Shuffle } from 'lucide-vue-next'
 
 const router = useRouter()
 const accountsStore = useAccountsStore()
@@ -67,6 +68,18 @@ const showToken = ref(false)
 
 // Delete confirmation
 const deleteDialogOpen = ref(false)
+
+// Invite dialog
+const inviteDialogOpen = ref(false)
+const invitingAccountId = ref<number | null>(null)
+const invitingAccountName = ref('')
+const inviteEmail = ref('')
+const inviting = ref(false)
+
+// Random invite dialog
+const randomInviteDialogOpen = ref(false)
+const randomInviteEmail = ref('')
+const randomInviting = ref(false)
 const pendingDelete = ref<Account | null>(null)
 
 // Pagination
@@ -185,6 +198,74 @@ function viewInvites(account: Account) {
   router.push(`/admin/teams/${account.id}/invites`)
 }
 
+function openInviteDialog(account: Account) {
+  invitingAccountId.value = account.id
+  invitingAccountName.value = account.name || account.team_account_id
+  inviteEmail.value = ''
+  inviteDialogOpen.value = true
+}
+
+async function handleInvite() {
+  if (!inviteEmail.value.trim()) {
+    toast.error('请输入邮箱地址')
+    return
+  }
+  if (!invitingAccountId.value) return
+
+  inviting.value = true
+  try {
+    const response = await inviteByAdmin({
+      email: inviteEmail.value.trim(),
+      account_id: invitingAccountId.value,
+    })
+    if (response.data.success) {
+      toast.success('邀请发送成功')
+      inviteDialogOpen.value = false
+      inviteEmail.value = ''
+      // Refresh account to update seats
+      if (invitingAccountId.value) {
+        await handleRefresh(accountsStore.accounts.find(a => a.id === invitingAccountId.value)!)
+      }
+    } else {
+      toast.error(response.data.message || '邀请失败')
+    }
+  } catch (e: any) {
+    toast.error(e.response?.data?.message || '邀请失败')
+  } finally {
+    inviting.value = false
+  }
+}
+
+// Random invite - auto select available team
+async function handleRandomInvite() {
+  if (!randomInviteEmail.value.trim()) {
+    toast.error('请输入邮箱地址')
+    return
+  }
+
+  randomInviting.value = true
+  try {
+    // Use account_id = 0 to let backend auto-select
+    const response = await inviteByAdmin({
+      email: randomInviteEmail.value.trim(),
+      account_id: 0,
+    })
+    if (response.data.success) {
+      toast.success(`邀请发送成功，已分配到: ${response.data.account_name || 'Team'}`)
+      randomInviteDialogOpen.value = false
+      randomInviteEmail.value = ''
+      // Refresh all accounts to update seats
+      await accountsStore.fetchAccounts()
+    } else {
+      toast.error(response.data.message || '邀请失败')
+    }
+  } catch (e: any) {
+    toast.error(e.response?.data?.message || '邀请失败')
+  } finally {
+    randomInviting.value = false
+  }
+}
+
 function goToPage(page: number) {
   if (page >= 1 && page <= totalPages.value) {
     currentPage.value = page
@@ -203,6 +284,7 @@ function handlePageSizeChange(value: any) {
   <div class="space-y-6">
     <div class="flex items-center justify-between">
       <h1 class="text-2xl font-bold">Team 管理</h1>
+      <div class="flex items-center gap-2">
       <Dialog v-model:open="dialogOpen">
         <DialogTrigger as-child>
           <Button>
@@ -268,6 +350,43 @@ function handlePageSizeChange(value: any) {
           </form>
         </DialogContent>
       </Dialog>
+
+      <!-- Random Invite Button and Dialog -->
+      <Dialog v-model:open="randomInviteDialogOpen">
+        <DialogTrigger as-child>
+          <Button variant="outline">
+            <Shuffle class="h-4 w-4 mr-2" />
+            随机邀请
+          </Button>
+        </DialogTrigger>
+        <DialogContent>
+          <DialogHeader>
+            <DialogTitle>随机邀请</DialogTitle>
+            <DialogDescription>
+              系统将自动选择有空位的 Team 发送邀请
+            </DialogDescription>
+          </DialogHeader>
+          <form @submit.prevent="handleRandomInvite" class="space-y-4">
+            <div class="space-y-2">
+              <Label for="random_invite_email">邮箱地址 *</Label>
+              <Input
+                id="random_invite_email"
+                v-model="randomInviteEmail"
+                type="email"
+                placeholder="user@example.com"
+                :disabled="randomInviting"
+              />
+            </div>
+            <DialogFooter>
+              <Button type="submit" :disabled="randomInviting">
+                <Loader2 v-if="randomInviting" class="h-4 w-4 mr-2 animate-spin" />
+                {{ randomInviting ? '邀请中...' : '发送邀请' }}
+              </Button>
+          </DialogFooter>
+          </form>
+        </DialogContent>
+      </Dialog>
+      </div>
     </div>
 
     <Card class="min-h-[600px] flex flex-col">
@@ -329,7 +448,10 @@ function handlePageSizeChange(value: any) {
                         ]"
                       />
                     </Button>
-                    <Button variant="outline" size="sm" @click="viewInvites(account)">
+                    <Button variant="outline" size="sm" @click="openInviteDialog(account)" title="直接邀请">
+                      <UserPlus class="h-4 w-4" />
+                    </Button>
+                    <Button variant="outline" size="sm" @click="viewInvites(account)" title="查看已邀请用户">
                       <Users class="h-4 w-4" />
                     </Button>
                     <Button
@@ -410,5 +532,35 @@ function handlePageSizeChange(value: any) {
         </AlertDialogFooter>
       </AlertDialogContent>
     </AlertDialog>
+
+    <!-- Invite dialog -->
+    <Dialog v-model:open="inviteDialogOpen">
+      <DialogContent>
+        <DialogHeader>
+          <DialogTitle>邀请用户</DialogTitle>
+          <DialogDescription>
+            邀请用户加入 Team: {{ invitingAccountName }}
+          </DialogDescription>
+        </DialogHeader>
+        <form @submit.prevent="handleInvite" class="space-y-4">
+          <div class="space-y-2">
+            <Label for="invite_email">邮箱地址 *</Label>
+            <Input
+              id="invite_email"
+              v-model="inviteEmail"
+              type="email"
+              placeholder="user@example.com"
+              :disabled="inviting"
+            />
+          </div>
+          <DialogFooter>
+            <Button type="submit" :disabled="inviting">
+              <Loader2 v-if="inviting" class="h-4 w-4 mr-2 animate-spin" />
+              {{ inviting ? '邀请中...' : '发送邀请' }}
+            </Button>
+          </DialogFooter>
+        </form>
+      </DialogContent>
+    </Dialog>
   </div>
 </template>