feat: add model and skill admin pages

frontend/src/lib/api.ts

@@ -2,13 +2,38 @@ const API_BASE_URL = import.meta.env.VITE_API_BASE_URL ?? 'http://localhost:8000
 
 let csrfToken: string | null = null
 
+export class ApiError extends Error {
+  status: number
+  payload: unknown
+
+  constructor(status: number, message: string, payload: unknown) {
+    super(message)
+    this.name = 'ApiError'
+    this.status = status
+    this.payload = payload
+  }
+}
+
+async function readError(response: Response) {
+  let payload: unknown
+  try {
+    payload = await response.json()
+  } catch {
+    payload = null
+  }
+  const detail = payload && typeof payload === 'object' && 'detail' in payload
+    ? String((payload as { detail: unknown }).detail)
+    : `API 请求失败（${response.status}）`
+  return new ApiError(response.status, detail, payload)
+}
+
 async function getCsrfToken() {
   if (!csrfToken) {
     const response = await fetch(`${API_BASE_URL}/accounts/auth/csrf`, {
       credentials: 'include'
     })
     if (!response.ok) {
-      throw new Error(`API request failed: ${response.status}`)
+      throw await readError(response)
     }
     const data = (await response.json()) as { csrfToken: string }
     csrfToken = data.csrfToken
@@ -33,7 +58,7 @@ export async function apiRequest<T>(path: string, init?: RequestInit): Promise<T
   })
 
   if (!response.ok) {
-    throw new Error(`API request failed: ${response.status}`)
+    throw await readError(response)
   }
 
   if (response.status === 204) {