feat: Add GitHub link float menu button

app/layout.tsx

@@ -5,6 +5,7 @@ import type { Metadata, Viewport } from "next"
 import { zpix } from "./fonts"
 import "./globals.css"
 import { Providers } from "./providers"
+import { FloatMenu } from "@/components/float-menu"
 
 export const metadata: Metadata = {
   title: "MoeMail - 萌萌哒临时邮箱服务",
@@ -98,6 +99,7 @@ export default function RootLayout({
             {children}
           </Providers>
           <Toaster />
+          <FloatMenu />
         </ThemeProvider>
       </body>
     </html>