fix: 修复 Antigravity 账号 intercept_warmup_requests 配置无法保存

提取 applyInterceptWarmup 纯函数统一所有调用点：
- 修复 upstream 创建时遗漏写入 intercept_warmup_requests
- 修复 apikey 编辑时缺少 else 清除逻辑
- 添加前后端单元测试
- 修复 vitest.config.ts mergeConfig 兼容性问题

frontend/src/components/account/CreateAccountModal.vue

@@ -2018,6 +2018,7 @@ import Icon from '@/components/icons/Icon.vue'
 import ProxySelector from '@/components/common/ProxySelector.vue'
 import GroupSelector from '@/components/common/GroupSelector.vue'
 import ModelWhitelistSelector from '@/components/account/ModelWhitelistSelector.vue'
+import { applyInterceptWarmup } from '@/components/account/credentialsBuilder'
 import { formatDateTimeLocalInput, parseDateTimeLocalInput } from '@/utils/format'
 import OAuthAuthorizationFlow from './OAuthAuthorizationFlow.vue'
 
@@ -2832,6 +2833,8 @@ const handleSubmit = async () => {
       credentials.model_mapping = antigravityModelMapping
     }
 
+    applyInterceptWarmup(credentials, interceptWarmupRequests.value, 'create')
+
     const extra = mixedScheduling.value ? { mixed_scheduling: true } : undefined
     await createAccountAndFinish(form.platform, 'apikey', credentials, extra)
     return
@@ -2872,10 +2875,7 @@ const handleSubmit = async () => {
     credentials.custom_error_codes = [...selectedErrorCodes.value]
   }
 
-  // Add intercept warmup requests setting
-  if (interceptWarmupRequests.value) {
-    credentials.intercept_warmup_requests = true
-  }
+  applyInterceptWarmup(credentials, interceptWarmupRequests.value, 'create')
   if (!applyTempUnschedConfig(credentials)) {
     return
   }
@@ -3220,6 +3220,7 @@ const handleAntigravityExchange = async (authCode: string) => {
 		if (!tokenInfo) return
 
 		const credentials = antigravityOAuth.buildCredentials(tokenInfo)
+		applyInterceptWarmup(credentials, interceptWarmupRequests.value, 'create')
 		// Antigravity 只使用映射模式
 		const antigravityModelMapping = buildModelMappingObject(
 			'mapping',
@@ -3291,10 +3292,8 @@ const handleAnthropicExchange = async (authCode: string) => {
       extra.cache_ttl_override_target = cacheTTLOverrideTarget.value
     }
 
-    const credentials = {
-      ...tokenInfo,
-      ...(interceptWarmupRequests.value ? { intercept_warmup_requests: true } : {})
-    }
+    const credentials: Record<string, unknown> = { ...tokenInfo }
+    applyInterceptWarmup(credentials, interceptWarmupRequests.value, 'create')
     await createAccountAndFinish(form.platform, addMethod.value as AccountType, credentials, extra)
   } catch (error: any) {
     oauth.error.value = error.response?.data?.detail || t('admin.accounts.oauth.authFailed')
@@ -3392,11 +3391,8 @@ const handleCookieAuth = async (sessionKey: string) => {
 
         const accountName = keys.length > 1 ? `${form.name} #${i + 1}` : form.name
 
-        // Merge interceptWarmupRequests into credentials
-        const credentials: Record<string, unknown> = {
-          ...tokenInfo,
-          ...(interceptWarmupRequests.value ? { intercept_warmup_requests: true } : {})
-        }
+        const credentials: Record<string, unknown> = { ...tokenInfo }
+        applyInterceptWarmup(credentials, interceptWarmupRequests.value, 'create')
         if (tempUnschedEnabled.value) {
           credentials.temp_unschedulable_enabled = true
           credentials.temp_unschedulable_rules = tempUnschedPayload

frontend/src/components/account/EditAccountModal.vue

@@ -1033,6 +1033,7 @@ import Icon from '@/components/icons/Icon.vue'
 import ProxySelector from '@/components/common/ProxySelector.vue'
 import GroupSelector from '@/components/common/GroupSelector.vue'
 import ModelWhitelistSelector from '@/components/account/ModelWhitelistSelector.vue'
+import { applyInterceptWarmup } from '@/components/account/credentialsBuilder'
 import { formatDateTimeLocalInput, parseDateTimeLocalInput } from '@/utils/format'
 import {
   getPresetMappingsByPlatform,
@@ -1748,9 +1749,7 @@ const handleSubmit = async () => {
       }
 
       // Add intercept warmup requests setting
-      if (interceptWarmupRequests.value) {
-        newCredentials.intercept_warmup_requests = true
-      }
+      applyInterceptWarmup(newCredentials, interceptWarmupRequests.value, 'edit')
       if (!applyTempUnschedConfig(newCredentials)) {
         return
       }
@@ -1766,6 +1765,9 @@ const handleSubmit = async () => {
         newCredentials.api_key = editApiKey.value.trim()
       }
 
+      // Add intercept warmup requests setting
+      applyInterceptWarmup(newCredentials, interceptWarmupRequests.value, 'edit')
+
       if (!applyTempUnschedConfig(newCredentials)) {
         return
       }
@@ -1776,11 +1778,7 @@ const handleSubmit = async () => {
       const currentCredentials = (props.account.credentials as Record<string, unknown>) || {}
       const newCredentials: Record<string, unknown> = { ...currentCredentials }
 
-      if (interceptWarmupRequests.value) {
-        newCredentials.intercept_warmup_requests = true
-      } else {
-        delete newCredentials.intercept_warmup_requests
-      }
+      applyInterceptWarmup(newCredentials, interceptWarmupRequests.value, 'edit')
       if (!applyTempUnschedConfig(newCredentials)) {
         return
       }

frontend/src/components/account/__tests__/credentialsBuilder.spec.ts

@@ -0,0 +1,46 @@
+import { describe, it, expect } from 'vitest'
+import { applyInterceptWarmup } from '../credentialsBuilder'
+
+describe('applyInterceptWarmup', () => {
+  it('create + enabled=true: should set intercept_warmup_requests to true', () => {
+    const creds: Record<string, unknown> = { access_token: 'tok' }
+    applyInterceptWarmup(creds, true, 'create')
+    expect(creds.intercept_warmup_requests).toBe(true)
+  })
+
+  it('create + enabled=false: should not add the field', () => {
+    const creds: Record<string, unknown> = { access_token: 'tok' }
+    applyInterceptWarmup(creds, false, 'create')
+    expect('intercept_warmup_requests' in creds).toBe(false)
+  })
+
+  it('edit + enabled=true: should set intercept_warmup_requests to true', () => {
+    const creds: Record<string, unknown> = { api_key: 'sk' }
+    applyInterceptWarmup(creds, true, 'edit')
+    expect(creds.intercept_warmup_requests).toBe(true)
+  })
+
+  it('edit + enabled=false + field exists: should delete the field', () => {
+    const creds: Record<string, unknown> = { api_key: 'sk', intercept_warmup_requests: true }
+    applyInterceptWarmup(creds, false, 'edit')
+    expect('intercept_warmup_requests' in creds).toBe(false)
+  })
+
+  it('edit + enabled=false + field absent: should not throw', () => {
+    const creds: Record<string, unknown> = { api_key: 'sk' }
+    applyInterceptWarmup(creds, false, 'edit')
+    expect('intercept_warmup_requests' in creds).toBe(false)
+  })
+
+  it('should not affect other fields', () => {
+    const creds: Record<string, unknown> = {
+      api_key: 'sk',
+      base_url: 'url',
+      intercept_warmup_requests: true
+    }
+    applyInterceptWarmup(creds, false, 'edit')
+    expect(creds.api_key).toBe('sk')
+    expect(creds.base_url).toBe('url')
+    expect('intercept_warmup_requests' in creds).toBe(false)
+  })
+})

frontend/src/components/account/credentialsBuilder.ts

@@ -0,0 +1,11 @@
+export function applyInterceptWarmup(
+  credentials: Record<string, unknown>,
+  enabled: boolean,
+  mode: 'create' | 'edit'
+): void {
+  if (enabled) {
+    credentials.intercept_warmup_requests = true
+  } else if (mode === 'edit') {
+    delete credentials.intercept_warmup_requests
+  }
+}