fix: open student demo through hash route

src/views/studentDemo/index.vue

@@ -19,7 +19,7 @@ function receiveTicket(event) {
     saveStudentDemoSession(res.data);
     window.clearInterval(readyTimer);
     window.removeEventListener("message", receiveTicket);
-    window.location.replace("/index");
+    window.location.replace("/#/index");
   }).catch(() => { message.value = "演示链接已失效，请返回教师端重新打开。"; });
 }
 

src/views/teacherEnd/trainingTask/index.vue

@@ -578,7 +578,7 @@ async function restoreAllTasksDefaults() {
 
 async function openStudentDemo() {
   if (!selectedTeachingClass.value) return;
-  const child = window.open("/student-demo", "_blank");
+  const child = window.open("/#/student-demo", "_blank");
   if (!child) { proxy?.$modal?.msgError?.("浏览器拦截了演示窗口，请允许弹窗后重试"); return; }
   let ticket = "";
   let childReady = false;

tests/student-demo-hash-routing.test.mjs

@@ -0,0 +1,12 @@
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import { resolve } from "node:path";
+
+const root = resolve(import.meta.dirname, "..");
+const teacherTaskPage = readFileSync(resolve(root, "src/views/teacherEnd/trainingTask/index.vue"), "utf8");
+const studentDemoPage = readFileSync(resolve(root, "src/views/studentDemo/index.vue"), "utf8");
+
+assert.match(teacherTaskPage, /window\.open\("\/#\/student-demo", "_blank"\)/, "学生端讲解必须通过 Hash 路由打开演示入口");
+assert.match(studentDemoPage, /window\.location\.replace\("\/#\/index"\)/, "兑换演示学生会话后必须通过 Hash 路由进入学生首页");
+
+console.log("student demo uses hash routes instead of falling back to the teacher homepage");