feat(codex): 拆分openai:compact为独立端点，简化Codex请求为透传模式

- 新增openai:compact端点类型(EndpointKind.COMPACT)，独立于openai:cli
- OpenAICompactAdapter继承OpenAICliAdapter，自动标记compact模式
- Codex请求补丁改为纯透传：仅清理内部标记，不再修改客户端payload
- stream_policy支持openai:compact独立策略，compact端点移除stream字段
- candidate_builder支持compact回退到cli端点
- auth_type: vertex_ai重命名为service_account，保持向后兼容
- Vertex Provider新增api_formats与auth_type组合校验
- KeyAllowedModels对话框改为从Provider获取模型，展示provider_model_name
- Dialog内Select组件自动禁用Portal，修复层级遮挡问题
- 新增Codex compact端点回填迁移脚本

frontend/src/features/usage/components/UsageRecordsTable.vue

@@ -723,6 +723,7 @@ const emit = defineEmits<{
 const AVAILABLE_API_FORMATS = [
   { value: 'openai:chat', label: 'OpenAI Chat' },
   { value: 'openai:cli', label: 'OpenAI CLI' },
+  { value: 'openai:compact', label: 'OpenAI Compact' },
   { value: 'openai:video', label: 'OpenAI Video' },
   { value: 'claude:chat', label: 'Claude Chat' },
   { value: 'claude:cli', label: 'Claude CLI' },

frontend/src/features/usage/conversation/__tests__/gemini.spec.ts

@@ -0,0 +1,52 @@
+import { describe, it, expect } from 'vitest'
+import { parseResponse, renderResponse } from '../registry'
+
+describe('Gemini conversation parser', () => {
+  const requestBody = { model: 'gemini-3-pro-preview' }
+  const normalizedResponse = {
+    status: 'completed',
+    output: [
+      {
+        type: 'message',
+        role: 'assistant',
+        content: [
+          {
+            type: 'output_text',
+            text: 'Hello!',
+          },
+        ],
+      },
+    ],
+  }
+
+  it('parses normalized output payload when hint is gemini', () => {
+    const parsed = parseResponse(normalizedResponse, requestBody, 'gemini:chat')
+    expect(parsed.apiFormat).toBe('gemini')
+    expect(parsed.messages).toHaveLength(1)
+    expect(parsed.messages[0]?.role).toBe('assistant')
+    expect(parsed.messages[0]?.content[0]).toMatchObject({
+      type: 'text',
+      text: 'Hello!',
+    })
+  })
+
+  it('renders normalized output payload when hint is gemini', () => {
+    const rendered = renderResponse(normalizedResponse, requestBody, 'gemini:chat')
+    expect(rendered.error).toBeUndefined()
+    expect(rendered.blocks).toHaveLength(1)
+    expect(rendered.blocks[0]).toMatchObject({
+      type: 'message',
+      role: 'assistant',
+    })
+
+    const firstBlock = rendered.blocks[0]
+    if (!firstBlock || firstBlock.type !== 'message') {
+      throw new Error('expected first render block to be message')
+    }
+
+    expect(firstBlock.content[0]).toMatchObject({
+      type: 'text',
+      content: 'Hello!',
+    })
+  })
+})