feat(POSTV1-03): 增加本机测试直达入口

apps/web/src/user-auth.tsx

@@ -77,6 +77,9 @@ export function UserAuthPage() {
   const [sendState, setSendState] = useState<SendState>("idle");
   const [countdown, setCountdown] = useState(0);
   const [error, setError] = useState<string>();
+  const [localTestAvailable, setLocalTestAvailable] = useState(false);
+  const [localTestError, setLocalTestError] = useState<string>();
+  const [localTestSubmitting, setLocalTestSubmitting] = useState(false);
   const [submitting, setSubmitting] = useState(false);
   const emailValid = /^[^@\s]+@[^@\s]+$/.test(email);
   const registrationReady = Boolean(
@@ -93,6 +96,18 @@ export function UserAuthPage() {
     return () => window.clearInterval(timer);
   }, [countdown]);
 
+  useEffect(() => {
+    const controller = new AbortController();
+    void fetch("/api/v1/auth/local-test", { credentials: "same-origin", signal: controller.signal })
+      .then(async (response) => {
+        if (!response.ok || !response.headers.get("content-type")?.includes("application/json")) return;
+        const body = await response.json() as { available?: boolean };
+        if (body.available === true) setLocalTestAvailable(true);
+      })
+      .catch(() => undefined);
+    return () => controller.abort();
+  }, []);
+
   useEffect(() => {
     if (!noticeOpen) return;
     const previousOverflow = document.body.style.overflow;
@@ -255,6 +270,27 @@ export function UserAuthPage() {
     }
   }
 
+  async function enterLocalTest() {
+    if (localTestSubmitting) return;
+    setLocalTestSubmitting(true);
+    setLocalTestError(undefined);
+    try {
+      const response = await fetch("/api/v1/auth/local-test", {
+        credentials: "same-origin",
+        method: "POST",
+      });
+      if (!response.ok) {
+        setLocalTestError("本机测试会话未能建立，请重试。");
+        return;
+      }
+      window.location.assign("/app");
+    } catch {
+      setLocalTestError("本机测试会话未能建立，请重试。");
+    } finally {
+      setLocalTestSubmitting(false);
+    }
+  }
+
   return (
     <>
       <main className="auth-page">
@@ -271,6 +307,14 @@ export function UserAuthPage() {
       <section className="auth-content">
         <a className="auth-admin-link" href="/admin/login">管理员登录</a>
         <div className="auth-panel">
+          {localTestAvailable ? (
+            <div className="auth-test-entry">
+              <button className="auth-primary" disabled={localTestSubmitting} onClick={enterLocalTest} type="button">
+                {localTestSubmitting ? "正在进入" : "直接进入本机测试"}
+              </button>
+              {localTestError ? <p className="auth-error" role="alert">{localTestError}</p> : null}
+            </div>
+          ) : null}
           <div className="auth-tabs" role="tablist" aria-label="认证方式">
             <button
               aria-selected={mode === "login"}