Add WeChat auth entry for H5

hy_qa_asset_backend/frontend/components/h5/H5QAExperience.tsx

@@ -128,6 +128,20 @@ export default function H5QAExperience() {
       .finally(() => setLoadingQa(false));
   }, []);
 
+  useEffect(() => {
+    const params = new URLSearchParams(window.location.search);
+    const code = params.get("code");
+    const state = params.get("state");
+    if (code && state === "hyqa_h5") {
+      setUser({
+        mode: "wechat",
+        name: "微信已授权",
+        phone: "等待后端换取登录态"
+      });
+      window.history.replaceState(null, "", window.location.pathname);
+    }
+  }, []);
+
   useEffect(() => {
     bottomRef.current?.scrollIntoView({ behavior: "smooth", block: "end" });
   }, [messages, activeTab]);
@@ -141,6 +155,15 @@ export default function H5QAExperience() {
     setAuthOpen(false);
   }
 
+  function mockWechatLogin() {
+    setUser({
+      mode: "wechat",
+      name: "微信用户",
+      phone: "微信授权演示"
+    });
+    setAuthOpen(false);
+  }
+
   function persistMessages(nextMessages: ChatMessage[]) {
     setMessages(nextMessages);
     setSessions((current) => {
@@ -413,6 +436,7 @@ export default function H5QAExperience() {
             user={user}
             onClose={() => setAuthOpen(false)}
             onMockLogin={mockLogin}
+            onWechatMockLogin={mockWechatLogin}
             onLogout={() => {
               setUser(null);
               setAuthOpen(false);