Add GitHub link with icon to header

Added GitHub organization link (github.com/nbtca) to the right side of the header navigation using the provided SVG icon. The link opens in a new tab and maintains proper accessibility attributes.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/header/HeaderNavigation.tsx

@@ -13,16 +13,16 @@ export default function App() {
     },
     {
       link: "/calendar",
-      name: "日程",
-    },
-    {
-      link: "/about",
-      name: "关于我们",
+      name: "活动",
     },
     {
       link: "/repair",
       name: "维修",
     },
+    {
+      link: "/about",
+      name: "关于我们",
+    },
   ]
 
   return (
@@ -55,6 +55,11 @@ export default function App() {
               </NavbarItem>
             ))
           }
+          <NavbarItem>
+            <Link href="https://github.com/nbtca" target="_blank" rel="noopener noreferrer" className="flex items-center">
+              <img src="/src/pages/_assets/github-mark.svg" alt="GitHub" className="w-6 h-6" />
+            </Link>
+          </NavbarItem>
         </NavbarContent>
 
         <NavbarMenuToggle

src/pages/_assets/github-mark.svg

@@ -0,0 +1 @@
+<svg width="98" height="96" xmlns="http://www.w3.org/2000/svg"><path fill-rule="evenodd" clip-rule="evenodd" d="M48.854 0C21.839 0 0 22 0 49.217c0 21.756 13.993 40.172 33.405 46.69 2.427.49 3.316-1.059 3.316-2.362 0-1.141-.08-5.052-.08-9.127-13.59 2.934-16.42-5.867-16.42-5.867-2.184-5.704-5.42-7.17-5.42-7.17-4.448-3.015.324-3.015.324-3.015 4.934.326 7.523 5.052 7.523 5.052 4.367 7.496 11.404 5.378 14.235 4.074.404-3.178 1.699-5.378 3.074-6.6-10.839-1.141-22.243-5.378-22.243-24.283 0-5.378 1.94-9.778 5.014-13.2-.485-1.222-2.184-6.275.486-13.038 0 0 4.125-1.304 13.426 5.052a46.97 46.97 0 0 1 12.214-1.63c4.125 0 8.33.571 12.213 1.63 9.302-6.356 13.427-5.052 13.427-5.052 2.67 6.763.97 11.816.485 13.038 3.155 3.422 5.015 7.822 5.015 13.2 0 18.905-11.404 23.06-22.324 24.283 1.78 1.548 3.316 4.481 3.316 9.126 0 6.6-.08 11.897-.08 13.526 0 1.304.89 2.853 3.316 2.364 19.412-6.52 33.405-24.935 33.405-46.691C97.707 22 75.788 0 48.854 0z" fill="#24292f"/></svg>