feat: update footer to include GitHub link and clean up CSS comments

web/templates/index.html

@@ -39,7 +39,7 @@
             height: 2px;
             width: 150vw; /* 增加宽度确保激光覆盖旋转后的视口 */
             transform-origin: 0 0;
-            left: -25vw; /* 偏移，确保即使旋转也能覆盖整个屏幕 */
+            left: -25vw;
         }
 
         .laser-beam:nth-child(2n) {
@@ -1147,7 +1147,7 @@
         </main>
 
         <footer class="text-center mt-10 py-4 text-slate-600 text-sm">
-            <p>© 2025 TTS服务</p>
+            <p>© 2025 TTS服务 | <a href="https://github.com/zuoban/tts" target="_blank" class="text-blue-500 hover:underline">GitHub</a></p>
         </footer>
     </div>
 </div>