fix: stabilize auth and generation workflows

admin-frontend/src/api/client.ts

@@ -1,23 +1,35 @@
 const BASE_URL = ''
 
-class ApiClient {
-  async request<T>(url: string, options: RequestInit = {}): Promise<T> {
-    const response = await fetch(`${BASE_URL}${url}`, {
-      ...options,
-      credentials: 'include',
-      headers: {
-        'Content-Type': 'application/json',
-        ...options.headers,
-      },
-    })
-
-    if (!response.ok) {
-      const error = await response.json().catch(() => ({ detail: '请求失败' }))
-      throw new Error(error.detail || '请求失败')
-    }
-
-    return response.json()
-  }
+class ApiClient {
+  async request<T>(url: string, options: RequestInit = {}): Promise<T> {
+    const headers = new Headers(options.headers || {})
+    const isFormData = options.body instanceof FormData
+    if (!isFormData && !headers.has('Content-Type')) {
+      headers.set('Content-Type', 'application/json')
+    }
+
+    const response = await fetch(`${BASE_URL}${url}`, {
+      ...options,
+      credentials: 'include',
+      headers,
+    })
+
+    if (!response.ok) {
+      const error = await response.json().catch(() => ({ detail: '请求失败' }))
+      throw new Error(error.detail || '请求失败')
+    }
+
+    if (response.status === 204 || response.status === 205) {
+      return undefined as T
+    }
+
+    const contentType = response.headers.get('content-type') || ''
+    if (!contentType.includes('application/json')) {
+      return undefined as T
+    }
+
+    return response.json()
+  }
 
   get<T>(url: string): Promise<T> {
     return this.request<T>(url)