feat(openai): port /responses/compact account support flow (PR #1555)

将 vansour/sub2api#1555 的 OpenAI compact 能力建模手工移植到当前 main：账号
级 compact 状态/auto-force_on-force_off 模式、compact-only 模型映射、调度器
tier 分层（已支持 > 未知 > 已知不支持）、管理后台 compact 主动探测，以及对应
i18n/状态徽章。普通 /responses 流量行为不变，无数据库迁移。

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

@@ -122,7 +122,7 @@ describe('AccountStatusIndicator', () => {
       }
     })
 
-    expect(wrapper.text()).toContain('account.creditsExhausted')
+    expect(wrapper.text()).toContain('admin.accounts.status.creditsExhausted')
   })
 
   it('模型限流 + overages 启用 + AICredits key 生效 → 普通限流样式（积分耗尽，无 ⚡）', () => {
@@ -157,6 +157,6 @@ describe('AccountStatusIndicator', () => {
     expect(wrapper.text()).toContain('CSon45')
     expect(wrapper.text()).not.toContain('⚡')
     // AICredits 积分耗尽状态应显示
-    expect(wrapper.text()).toContain('account.creditsExhausted')
+    expect(wrapper.text()).toContain('admin.accounts.status.creditsExhausted')
   })
 })

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

@@ -0,0 +1,150 @@
+import { describe, expect, it, vi, beforeEach, afterEach } from 'vitest'
+import { flushPromises, mount } from '@vue/test-utils'
+import { defineComponent } from 'vue'
+import AccountTestModal from '../AccountTestModal.vue'
+
+const { getAvailableModelsMock } = vi.hoisted(() => ({
+  getAvailableModelsMock: vi.fn()
+}))
+
+vi.mock('@/api/admin', () => ({
+  adminAPI: {
+    accounts: {
+      getAvailableModels: getAvailableModelsMock
+    }
+  }
+}))
+
+vi.mock('@/composables/useClipboard', () => ({
+  useClipboard: () => ({
+    copyToClipboard: vi.fn()
+  })
+}))
+
+vi.mock('vue-i18n', async () => {
+  const actual = await vi.importActual<typeof import('vue-i18n')>('vue-i18n')
+  return {
+    ...actual,
+    useI18n: () => ({
+      t: (key: string) => key
+    })
+  }
+})
+
+const BaseDialogStub = defineComponent({
+  name: 'BaseDialog',
+  props: { show: { type: Boolean, default: false } },
+  template: '<div v-if="show"><slot /><slot name="footer" /></div>'
+})
+
+const SelectStub = defineComponent({
+  name: 'SelectStub',
+  props: {
+    modelValue: { type: [String, Number, Boolean, null], default: '' },
+    options: { type: Array, default: () => [] },
+    valueKey: { type: String, default: 'value' },
+    labelKey: { type: String, default: 'label' }
+  },
+  emits: ['update:modelValue'],
+  template: `
+    <select
+      v-bind="$attrs"
+      :value="modelValue"
+      @change="$emit('update:modelValue', $event.target.value)"
+    >
+      <option
+        v-for="option in options"
+        :key="option[valueKey]"
+        :value="option[valueKey]"
+      >
+        {{ option[labelKey] }}
+      </option>
+    </select>
+  `
+})
+
+const TextAreaStub = defineComponent({
+  name: 'TextArea',
+  props: {
+    modelValue: { type: String, default: '' }
+  },
+  emits: ['update:modelValue'],
+  template: `
+    <textarea
+      v-bind="$attrs"
+      :value="modelValue"
+      @input="$emit('update:modelValue', $event.target.value)"
+    />
+  `
+})
+
+function buildAccount() {
+  return {
+    id: 1,
+    name: 'OpenAI OAuth',
+    platform: 'openai',
+    type: 'oauth',
+    status: 'active',
+    credentials: {},
+    extra: {},
+    concurrency: 1,
+    priority: 1,
+    proxy_id: null,
+    auto_pause_on_expired: false
+  } as any
+}
+
+describe('AccountTestModal', () => {
+  const originalFetch = global.fetch
+
+  beforeEach(() => {
+    getAvailableModelsMock.mockReset()
+    getAvailableModelsMock.mockResolvedValue([
+      { id: 'gpt-5.4', display_name: 'GPT-5.4' }
+    ])
+    global.fetch = vi.fn().mockResolvedValue({
+      ok: true,
+      body: {
+        getReader: () => ({
+          read: vi.fn().mockResolvedValue({ done: true, value: undefined })
+        })
+      }
+    } as any)
+    localStorage.setItem('auth_token', 'test-token')
+  })
+
+  afterEach(() => {
+    global.fetch = originalFetch
+    localStorage.clear()
+  })
+
+  it('posts compact mode for OpenAI compact probe', async () => {
+    const wrapper = mount(AccountTestModal, {
+      props: {
+        show: true,
+        account: buildAccount()
+      },
+      global: {
+        stubs: {
+          BaseDialog: BaseDialogStub,
+          Select: SelectStub,
+          TextArea: TextAreaStub,
+          Icon: true
+        }
+      }
+    })
+
+    await flushPromises()
+    ;(wrapper.vm as any).selectedModelId = 'gpt-5.4'
+    ;(wrapper.vm as any).testMode = 'compact'
+    await (wrapper.vm as any).startTest()
+    await flushPromises()
+
+    expect(global.fetch).toHaveBeenCalledTimes(1)
+    const [, options] = (global.fetch as any).mock.calls[0]
+    expect(JSON.parse(options.body)).toMatchObject({
+      model_id: 'gpt-5.4',
+      mode: 'compact'
+    })
+  })
+})

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

@@ -26,6 +26,13 @@ vi.mock('@/api/admin', () => ({
     accounts: {
       update: updateAccountMock,
       checkMixedChannelRisk: checkMixedChannelRiskMock
+    },
+    settings: {
+      getWebSearchEmulationConfig: vi.fn().mockResolvedValue({ enabled: false, providers: [] }),
+      getSettings: vi.fn().mockResolvedValue({})
+    },
+    tlsFingerprintProfiles: {
+      list: vi.fn().mockResolvedValue([])
     }
   }
 }))
@@ -82,6 +89,32 @@ const ModelWhitelistSelectorStub = defineComponent({
   `
 })
 
+const SelectStub = defineComponent({
+  name: 'SelectStub',
+  props: {
+    modelValue: {
+      type: [String, Number, Boolean, null],
+      default: ''
+    },
+    options: {
+      type: Array,
+      default: () => []
+    }
+  },
+  emits: ['update:modelValue'],
+  template: `
+    <select
+      v-bind="$attrs"
+      :value="modelValue"
+      @change="$emit('update:modelValue', $event.target.value)"
+    >
+      <option v-for="option in options" :key="option.value" :value="option.value">
+        {{ option.label }}
+      </option>
+    </select>
+  `
+})
+
 function buildAccount() {
   return {
     id: 1,
@@ -119,7 +152,7 @@ function mountModal(account = buildAccount()) {
     global: {
       stubs: {
         BaseDialog: BaseDialogStub,
-        Select: true,
+        Select: SelectStub,
         Icon: true,
         ProxySelector: true,
         GroupSelector: true,
@@ -156,4 +189,31 @@ describe('EditAccountModal', () => {
       'gpt-5.2': 'gpt-5.2'
     })
   })
+
+  it('submits OpenAI compact mode and compact-only model mapping', async () => {
+    const account = buildAccount()
+    account.extra = {
+      openai_compact_mode: 'force_on'
+    }
+    account.credentials = {
+      ...account.credentials,
+      compact_model_mapping: {
+        'gpt-5.4': 'gpt-5.4-openai-compact'
+      }
+    }
+    updateAccountMock.mockReset()
+    checkMixedChannelRiskMock.mockReset()
+    checkMixedChannelRiskMock.mockResolvedValue({ has_risk: false })
+    updateAccountMock.mockResolvedValue(account)
+
+    const wrapper = mountModal(account)
+
+    await wrapper.get('form#edit-account-form').trigger('submit.prevent')
+
+    expect(updateAccountMock).toHaveBeenCalledTimes(1)
+    expect(updateAccountMock.mock.calls[0]?.[1]?.extra?.openai_compact_mode).toBe('force_on')
+    expect(updateAccountMock.mock.calls[0]?.[1]?.credentials?.compact_model_mapping).toEqual({
+      'gpt-5.4': 'gpt-5.4-openai-compact'
+    })
+  })
 })