Chore: remove promotional copy and home-training wording

client/src/pages/Tutorials.tsx

@@ -98,7 +98,7 @@ export default function Tutorials() {
           <BookOpen className="w-6 h-6 text-primary" />
           教程库
         </h1>
-        <p className="text-muted-foreground mt-1">专业动作分解与要领，对照标准动作提升技术</p>
+        <p className="text-muted-foreground mt-1">查看动作分解、要点说明和常见错误</p>
       </div>
 
       {/* Progress Overview */}