fix(groups): 用户分组不下发内部路由信息

- 普通用户 Group DTO 移除 model_routing/account_count/account_groups，避免泄露内部路由与账号信息\n- 新增 AdminGroup DTO，并仅在管理员分组接口返回完整字段\n- 前端拆分 Group/AdminGroup，管理端页面与 API 使用 AdminGroup\n- 增加 /api/v1/groups/available 契约测试，防止回归

frontend/src/components/account/BulkEditAccountModal.vue

@@ -648,7 +648,7 @@ import { ref, watch, computed } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { useAppStore } from '@/stores/app'
 import { adminAPI } from '@/api/admin'
-import type { Proxy, Group } from '@/types'
+import type { Proxy, AdminGroup } from '@/types'
 import BaseDialog from '@/components/common/BaseDialog.vue'
 import Select from '@/components/common/Select.vue'
 import ProxySelector from '@/components/common/ProxySelector.vue'
@@ -659,7 +659,7 @@ interface Props {
   show: boolean
   accountIds: number[]
   proxies: Proxy[]
-  groups: Group[]
+  groups: AdminGroup[]
 }
 
 const props = defineProps<Props>()

frontend/src/components/account/CreateAccountModal.vue

@@ -1816,7 +1816,7 @@ import {
 import { useOpenAIOAuth } from '@/composables/useOpenAIOAuth'
 import { useGeminiOAuth } from '@/composables/useGeminiOAuth'
 import { useAntigravityOAuth } from '@/composables/useAntigravityOAuth'
-import type { Proxy, Group, AccountPlatform, AccountType } from '@/types'
+import type { Proxy, AdminGroup, AccountPlatform, AccountType } from '@/types'
 import BaseDialog from '@/components/common/BaseDialog.vue'
 import Icon from '@/components/icons/Icon.vue'
 import ProxySelector from '@/components/common/ProxySelector.vue'
@@ -1862,7 +1862,7 @@ const apiKeyHint = computed(() => {
 interface Props {
   show: boolean
   proxies: Proxy[]
-  groups: Group[]
+  groups: AdminGroup[]
 }
 
 const props = defineProps<Props>()

frontend/src/components/account/EditAccountModal.vue

@@ -883,7 +883,7 @@ import { useI18n } from 'vue-i18n'
 import { useAppStore } from '@/stores/app'
 import { useAuthStore } from '@/stores/auth'
 import { adminAPI } from '@/api/admin'
-import type { Account, Proxy, Group } from '@/types'
+import type { Account, Proxy, AdminGroup } from '@/types'
 import BaseDialog from '@/components/common/BaseDialog.vue'
 import Select from '@/components/common/Select.vue'
 import Icon from '@/components/icons/Icon.vue'
@@ -901,7 +901,7 @@ interface Props {
   show: boolean
   account: Account | null
   proxies: Proxy[]
-  groups: Group[]
+  groups: AdminGroup[]
 }
 
 const props = defineProps<Props>()

frontend/src/components/common/GroupSelector.vue

@@ -42,13 +42,13 @@
 import { computed } from 'vue'
 import { useI18n } from 'vue-i18n'
 import GroupBadge from './GroupBadge.vue'
-import type { Group, GroupPlatform } from '@/types'
+import type { AdminGroup, GroupPlatform } from '@/types'
 
 const { t } = useI18n()
 
 interface Props {
   modelValue: number[]
-  groups: Group[]
+  groups: AdminGroup[]
   platform?: GroupPlatform // Optional platform filter
   mixedScheduling?: boolean // For antigravity accounts: allow anthropic/gemini groups
 }