refactor: 全局适配 ApiFamily/EndpointKind 结构化标识体系

将新的 (ApiFamily, EndpointKind) / `family:kind` 签名体系应用到整个代码库：
- API Handlers: 所有 adapter/handler 使用新的签名格式
- Services: provider, model, usage, cache, auth 等服务层适配
- Database: ProviderEndpoint 新增 api_family/endpoint_kind 字段
- Frontend: Provider 管理、Usage 表格等组件适配
- Tests: 更新所有相关测试用例

frontend/src/views/admin/ProviderManagement.vue

@@ -989,7 +989,7 @@ function formatWebsiteDisplay(url: string): string {
 // 端点排序
 function sortEndpoints(endpoints: any[]) {
   return [...endpoints].sort((a, b) => {
-    const order = ['CLAUDE', 'OPENAI', 'CLAUDE_COMPATIBLE', 'OPENAI_COMPATIBLE', 'GEMINI', 'GEMINI_COMPATIBLE']
+    const order = ['claude:chat', 'claude:cli', 'openai:chat', 'openai:cli', 'gemini:chat', 'gemini:cli', 'openai:video', 'gemini:video']
     return order.indexOf(a.api_format) - order.indexOf(b.api_format)
   })
 }