fix(frontend): resolve login redirect loop and clean up info tab

- Prevent infinite session probe requests on the login page by guarding the check with the authenticated user state and using the Latest Ref pattern.
- Decouple useEffect from resolveRedirectTarget by using resolveRedirectTargetRef to avoid searchParams dependency loops.
- Remove the unused '服务连接' Card from the settings info tab and clean up unused imports, queries, and properties.

frontend/components/auth/login-page.tsx

@@ -1,6 +1,6 @@
 "use client"
 
-import {useCallback, useEffect, useState} from "react"
+import {useCallback, useEffect, useRef, useState} from "react"
 import {AnimatePresence, motion} from "motion/react"
 import {useRouter, useSearchParams} from "next/navigation"
 import {toast} from "sonner"
@@ -27,7 +27,7 @@ import {safeRedirectTarget} from "@/lib/utils"
 export function LoginPage() {
   const router = useRouter()
   const searchParams = useSearchParams()
-  const { setUser } = useAuth()
+  const { user, setUser } = useAuth()
   const [showOTP, setShowOTP] = useState(false)
 
   /* 处理OAuth回调 */
@@ -39,6 +39,8 @@ export function LoginPage() {
   const [isCheckingSession, setIsCheckingSession] = useState(() => !searchParams.get('state') || !searchParams.get('code'))
 
   const [loginSuccess, setLoginSuccess] = useState(false)
+  const redirectedRef = useRef(false)
+  const callbackProcessedRef = useRef(false)
 
   const resolveRedirectTarget = useCallback(() => {
     const callbackUrl = searchParams.get('callbackUrl')
@@ -52,6 +54,11 @@ export function LoginPage() {
     return safeRedirectTarget(target)
   }, [searchParams])
 
+  const resolveRedirectTargetRef = useRef(resolveRedirectTarget)
+  useEffect(() => {
+    resolveRedirectTargetRef.current = resolveRedirectTarget
+  }, [resolveRedirectTarget])
+
 
   /* 登录页兜底：已登录用户直接跳转 */
   useEffect(() => {
@@ -63,6 +70,15 @@ export function LoginPage() {
       return
     }
 
+    if (user) {
+      if (!redirectedRef.current) {
+        redirectedRef.current = true
+        router.replace(resolveRedirectTargetRef.current())
+        setIsCheckingSession(false)
+      }
+      return
+    }
+
     let cancelled = false
 
     const checkExistingSession = async () => {
@@ -81,7 +97,10 @@ export function LoginPage() {
           if (payload?.data) {
             setUser(payload.data)
           }
-          router.replace(resolveRedirectTarget())
+          if (!redirectedRef.current) {
+            redirectedRef.current = true
+            router.replace(resolveRedirectTargetRef.current())
+          }
           return
         }
       } catch (error) {
@@ -100,7 +119,7 @@ export function LoginPage() {
     return () => {
       cancelled = true
     }
-  }, [router, searchParams, resolveRedirectTarget, setUser])
+  }, [router, searchParams, setUser, user])
 
   /* 回调逻辑 */
   useEffect(() => {
@@ -109,6 +128,9 @@ export function LoginPage() {
       const code = searchParams.get('code')
 
       if (state && code) {
+        if (callbackProcessedRef.current) return
+        callbackProcessedRef.current = true
+
         setIsProcessingCallback(true)
         try {
           const result = await services.auth.handleCallback({ state, code })
@@ -125,7 +147,10 @@ export function LoginPage() {
           toast.success(result.status === "bound" ? "绑定成功" : "登录成功")
 
           setTimeout(() => {
-            router.replace(resolveRedirectTarget())
+            if (!redirectedRef.current) {
+              redirectedRef.current = true
+              router.replace(resolveRedirectTargetRef.current())
+            }
           }, 1500)
         } catch (error) {
           console.error('OAuth callback error:', error)
@@ -136,7 +161,7 @@ export function LoginPage() {
       }
     }
     handleOAuthCallback()
-  }, [searchParams, router, resolveRedirectTarget, setUser])
+  }, [router, searchParams, setUser])
 
   return (
     <AuthShell wide={showOTP}>

frontend/components/common/settings/info-tab.tsx

@@ -1,10 +1,10 @@
 "use client"
 
 import {useMutation, useQuery} from "@tanstack/react-query"
-import {ExternalLink, RefreshCw, Server, Sparkles} from "lucide-react"
+import {ExternalLink, RefreshCw, Sparkles} from "lucide-react"
 import {toast} from "sonner"
 
-import {AdminService, apiConfig} from "@/lib/services"
+import {AdminService} from "@/lib/services"
 import {
   AlertDialog,
   AlertDialogAction,
@@ -30,12 +30,7 @@ function InfoRow({ label, value }: { label: string; value: React.ReactNode }) {
   )
 }
 
-interface InfoTabProps {
+export function InfoTab() {
-  systemConfigsLength: number
-  authSourcesLength: number
-}
-
-export function InfoTab({ systemConfigsLength, authSourcesLength }: InfoTabProps) {
   const updateQuery = useQuery({
     queryKey: ["admin", "update"],
     queryFn: () => AdminService.getUpdateStatus(),
@@ -163,27 +158,6 @@ export function InfoTab({ systemConfigsLength, authSourcesLength }: InfoTabProps
           ) : null}
         </CardContent>
       </Card>
-
-      <Card className="border border-dashed shadow-sm">
-        <CardHeader className="border-b border-dashed pb-4">
-          <div className="flex items-center gap-2">
-            <div className="p-1.5 rounded-lg bg-muted text-muted-foreground">
-              <Server className="size-4" />
-            </div>
-            <div>
-              <CardTitle className="text-base font-semibold">服务连接</CardTitle>
-              <CardDescription className="text-xs">前端 API 客户端的基础连接参数</CardDescription>
-            </div>
-          </div>
-        </CardHeader>
-        <CardContent className="pt-4">
-          <InfoRow label="API Base URL" value={apiConfig.baseURL || "同源"} />
-          <InfoRow label="请求超时" value={`${apiConfig.timeout}ms`} />
-          <InfoRow label="携带凭证" value={apiConfig.withCredentials ? "是" : "否"} />
-          <InfoRow label="系统配置项" value={`${systemConfigsLength} 项`} />
-          <InfoRow label="认证源数量" value={`${authSourcesLength} 个`} />
-        </CardContent>
-      </Card>
     </div>
   )
 }

frontend/components/common/settings/system-settings.tsx

@@ -35,12 +35,6 @@ export function SystemSettingsMain() {
     enabled: !!user?.is_admin,
   })
 
-  const authSourcesQuery = useQuery({
-    queryKey: ["auth", "sources"],
-    queryFn: () => AdminService.listAuthSources(),
-    enabled: !!user?.is_admin,
-  })
-
   const configs = useMemo(
     () => systemConfigMap(systemConfigsQuery.data ?? []),
     [systemConfigsQuery.data],
@@ -112,10 +106,7 @@ export function SystemSettingsMain() {
           <OtherTab configs={configs} />
         </TabsContent>
         <TabsContent value="info" className="pt-4">
-          <InfoTab
+          <InfoTab />
-            systemConfigsLength={systemConfigsQuery.data?.length ?? 0}
-            authSourcesLength={authSourcesQuery.data?.length ?? 0}
-          />
         </TabsContent>
       </Tabs>
     </motion.div>