refactor(auth): 优化401处理逻辑并提取登录跳转函数

将重复的401处理逻辑提取为redirectToLogin函数
修复刷新接口401时的循环重试问题
docs: 更新项目结构文档和快速启动指南

frontend/src/utils/axios.ts

@@ -63,11 +63,7 @@ async function tryRefreshAndRetry(original: RetryConfig, message?: string): Prom
     } catch (e: any) {
       pendingQueue.forEach(p => p.reject(e))
       pendingQueue = []
-      clearToken()
-      if (typeof window !== 'undefined' && window.location.pathname !== '/login') {
-        window.location.href = '/login'
-      }
-      return Promise.reject(e)
+      return redirectToLogin((e && e.message) || message)
     } finally {
       isRefreshing = false
     }
@@ -104,6 +100,10 @@ api.interceptors.response.use(
         const msg = body?.message || '未登录或登录已过期'
         return Promise.reject(new Error(msg))
       }
+      // 刷新接口返回业务 401：直接跳转登录，避免循环重试
+      if (reqUrl.includes('/auth/refresh')) {
+        return redirectToLogin(body?.message)
+      }
       return tryRefreshAndRetry(original, body?.message)
     }
     return r
@@ -120,6 +120,10 @@ api.interceptors.response.use(
         const msg = resp?.message || '用户名或密码错误'
         return Promise.reject(new Error(msg))
       }
+      // 刷新接口返回 401：直接跳转登录，避免循环重试
+      if (reqUrl.includes('/auth/refresh')) {
+        return redirectToLogin(resp?.message)
+      }
 
       // 已经重试过了，直接拒绝
       if (original._retry) {
@@ -144,14 +148,10 @@ api.interceptors.response.use(
             pendingQueue = []
             return api(original)
           }
-        } catch (e) {
+        } catch (e: any) {
           pendingQueue.forEach(p => p.reject(e))
           pendingQueue = []
-          clearToken()
-          if (typeof window !== 'undefined' && window.location.pathname !== '/login') {
-            window.location.href = '/login'
-          }
-          return Promise.reject(e)
+          return redirectToLogin((e && e.message) || resp?.message)
         } finally {
           isRefreshing = false
         }