feat: 用户创建和注册时使用系统配置的默认配额

- 新增 /api/admin/users/defaults/quota 接口获取默认配额
- 用户注册时从系统配置读取默认配额
- 管理员创建用户时自动获取并使用系统默认配额

frontend/src/api/users.ts

@@ -98,6 +98,11 @@ export const usersApi = {
     await apiClient.patch(`/api/admin/users/${userId}/quota`)
   },
 
+  async getDefaultQuota(): Promise<{ default_quota_usd: number }> {
+    const response = await apiClient.get<{ default_quota_usd: number }>('/api/admin/users/defaults/quota')
+    return response.data
+  },
+
   // 管理员统计
   async getUsageStats(): Promise<any> {
     const response = await apiClient.get('/api/admin/usage/stats')

frontend/src/features/users/components/UserFormDialog.vue

@@ -363,6 +363,7 @@ import { ModelMultiSelect } from '@/components/common'
 import { getProvidersSummary } from '@/api/endpoints/providers'
 import { getGlobalModels } from '@/api/global-models'
 import { adminApi } from '@/api/admin'
+import { usersApi } from '@/api/users'
 import { log } from '@/utils/logger'
 import type { ProviderWithEndpointsSummary, GlobalModelResponse } from '@/api/endpoints/types'
 
@@ -402,6 +403,7 @@ const endpointDropdownOpen = ref(false)
 const providers = ref<ProviderWithEndpointsSummary[]>([])
 const globalModels = ref<GlobalModelResponse[]>([])
 const apiFormats = ref<Array<{ value: string; label: string }>>([])
+const defaultQuota = ref<number>(10)
 
 // 表单数据
 const form = ref({
@@ -430,7 +432,7 @@ function resetForm() {
     password: '',
     confirmPassword: '',
     email: '',
-    quota: 10,
+    quota: defaultQuota.value,
     role: 'user',
     unlimited: false,
     is_active: true,
@@ -479,18 +481,22 @@ const isFormValid = computed(() => {
 })
 
 // 加载访问控制选项
-async function loadAccessControlOptions() {
+async function loadAccessControlOptions(): Promise<boolean> {
   try {
-    const [providersData, modelsData, formatsData] = await Promise.all([
+    const [providersData, modelsData, formatsData, quotaData] = await Promise.all([
       getProvidersSummary(),
       getGlobalModels({ limit: 1000, is_active: true }),
-      adminApi.getApiFormats()
+      adminApi.getApiFormats(),
+      usersApi.getDefaultQuota()
     ])
     providers.value = providersData
     globalModels.value = modelsData.models || []
     apiFormats.value = formatsData.formats || []
+    defaultQuota.value = quotaData.default_quota_usd
+    return true
   } catch (err) {
     log.error('加载访问限制选项失败:', err)
+    return false
   }
 }
 
@@ -551,9 +557,13 @@ function setSaving(value: boolean) {
 }
 
 // 监听打开状态，加载选项数据
-watch(isOpen, (val) => {
+watch(isOpen, async (val) => {
   if (val) {
-    loadAccessControlOptions()
+    const success = await loadAccessControlOptions()
+    // 创建模式下，仅在加载成功时更新表单配额
+    if (!isEditMode.value && success) {
+      form.value.quota = defaultQuota.value
+    }
   }
 })
 

src/api/admin/users/routes.py

@@ -15,6 +15,7 @@ from src.database import get_db
 from src.models.admin_requests import UpdateUserRequest
 from src.models.api import CreateApiKeyRequest, CreateUserRequest
 from src.models.database import ApiKey, User, UserRole
+from src.services.system.config import SystemConfigService
 from src.services.user.apikey import ApiKeyService
 from src.services.user.service import UserService
 
@@ -197,6 +198,20 @@ async def delete_user_api_key(
     return await pipeline.run(adapter=adapter, http_request=request, db=db, mode=adapter.mode)
 
 
+@router.get("/defaults/quota")
+async def get_default_quota(request: Request, db: Session = Depends(get_db)):
+    """
+    获取默认用户配额
+
+    获取系统配置的默认用户配额值，用于创建用户时的默认值。
+
+    **返回字段**:
+    - `default_quota_usd`: 默认配额（USD）
+    """
+    adapter = AdminGetDefaultQuotaAdapter()
+    return await pipeline.run(adapter=adapter, http_request=request, db=db, mode=adapter.mode)
+
+
 # ============== 管理员适配器实现 ==============
 
 
@@ -586,3 +601,15 @@ class AdminDeleteUserKeyAdapter(AdminApiAdapter):
         )
 
         return {"message": "API Key已删除"}
+
+
+class AdminGetDefaultQuotaAdapter(AdminApiAdapter):
+    """获取系统默认用户配额"""
+
+    async def handle(self, context):  # type: ignore[override]
+        db = context.db
+        default_quota = SystemConfigService.get_config(db, "default_user_quota_usd", default=10.0)
+
+        return {
+            "default_quota_usd": float(default_quota),
+        }

src/api/auth/routes.py

@@ -470,12 +470,16 @@ class AuthRegisterAdapter(AuthPublicAdapter):
                 )
 
         try:
+            # 读取系统配置的默认配额
+            default_quota = SystemConfigService.get_config(db, "default_user_quota_usd", default=10.0)
+
             user = UserService.create_user(
                 db=db,
                 email=register_request.email,
                 username=register_request.username,
                 password=register_request.password,
                 role=UserRole.USER,
+                quota_usd=default_quota,
             )
             AuditService.log_event(
                 db=db,