feat(gateway): 重构 usage 数据层、迁移系统与系统导入

数据库迁移:
- 引入 baseline v2 bootstrap，空库首次启动自动初始化
- 服务启动不再自动执行迁移，需显式 `--migrate` 运行
- 新增 pending migration 检测，schema 落后时拒绝启动

Usage 数据层:
- usage body 存储外部化为独立 blob 表
- 新增 HTTP audit 表拆分存储请求/响应头与 body ref
- 后台清理任务支持 legacy body ref 元数据迁移
- usage runtime 写入迁移到专用 tokio runtime（独立线程池, 8MB 栈）

系统导入/导出:
- 支持用户、API Keys、钱包数据的完整导入
- 兼容 legacy 与 v1.3+ 两种导出格式

其他改进:
- executor outcome 增加 runtime miss 诊断上下文
- 主 tokio runtime 栈大小调整为 8MB
- 前端 provider 管理支持 base URL 配置
- dev.sh 支持 --migrate 参数

frontend/src/api/endpoints/providers.ts

@@ -7,6 +7,7 @@ import type {
   ProviderWithEndpointsSummary,
   ProxyConfig,
 } from './types'
+import { normalizePoolAdvancedConfig as normalizePoolAdvanced } from './types'
 
 interface ProviderRequestOptions {
   timeout?: number
@@ -31,6 +32,15 @@ export interface ProviderSummaryPageResponse {
   items: ProviderWithEndpointsSummary[]
 }
 
+function normalizeProviderSummary(
+  provider: ProviderWithEndpointsSummary,
+): ProviderWithEndpointsSummary {
+  return {
+    ...provider,
+    pool_advanced: normalizePoolAdvanced(provider.pool_advanced),
+  }
+}
+
 export async function getProvidersSummary(
   params: ProviderSummaryQuery = {},
 ): Promise<ProviderSummaryPageResponse> {
@@ -38,7 +48,10 @@ export async function getProvidersSummary(
     '/api/admin/providers/summary',
     { params },
   )
-  return response.data
+  return {
+    ...response.data,
+    items: response.data.items.map(normalizeProviderSummary),
+  }
 }
 
 /**
@@ -46,7 +59,7 @@ export async function getProvidersSummary(
  */
 export async function getProvider(providerId: string): Promise<ProviderWithEndpointsSummary> {
   const response = await client.get<ProviderWithEndpointsSummary>(`/api/admin/providers/${providerId}/summary`)
-  return response.data
+  return normalizeProviderSummary(response.data)
 }
 
 /**
@@ -81,7 +94,7 @@ export async function updateProvider(
   requestOptions?: ProviderRequestOptions,
 ): Promise<ProviderWithEndpointsSummary> {
   const response = await client.patch(`/api/admin/providers/${providerId}`, data, requestOptions)
-  return response.data
+  return normalizeProviderSummary(response.data)
 }
 
 /**

frontend/src/api/endpoints/types/__tests__/provider.spec.ts

@@ -0,0 +1,21 @@
+import { describe, expect, it } from 'vitest'
+
+import { normalizePoolAdvancedConfig } from '@/api/endpoints/types'
+
+describe('normalizePoolAdvancedConfig', () => {
+  it('keeps object payloads, including empty objects', () => {
+    expect(normalizePoolAdvancedConfig({})).toEqual({})
+    expect(normalizePoolAdvancedConfig({ global_priority: 5 })).toEqual({ global_priority: 5 })
+  })
+
+  it('maps legacy boolean payloads to the current object semantics', () => {
+    expect(normalizePoolAdvancedConfig(true)).toEqual({})
+    expect(normalizePoolAdvancedConfig(false)).toBeNull()
+  })
+
+  it('drops unsupported payload shapes', () => {
+    expect(normalizePoolAdvancedConfig(null)).toBeNull()
+    expect(normalizePoolAdvancedConfig('enabled')).toBeNull()
+    expect(normalizePoolAdvancedConfig(['lru'])).toBeNull()
+  })
+})

frontend/src/api/endpoints/types/provider.ts

@@ -517,6 +517,17 @@ export interface PoolAdvancedConfig {
   auto_remove_banned_keys?: boolean
 }
 
+function isPlainObject(value: unknown): value is Record<string, unknown> {
+  return typeof value === 'object' && value !== null && !Array.isArray(value)
+}
+
+export function normalizePoolAdvancedConfig(value: unknown): PoolAdvancedConfig | null {
+  if (value == null || value === false) return null
+  if (value === true) return {}
+  if (!isPlainObject(value)) return null
+  return { ...value } as PoolAdvancedConfig
+}
+
 export interface FailoverRuleItem {
   pattern: string
   description?: string