copy(sidebar): update footer version tag from Alpha-Test to V1.0.0-rc

src/components/layout/Sidebar.tsx

@@ -298,7 +298,7 @@ export function Sidebar({ pets }: SidebarProps) {
               </Link>
             </div>
             <p className="text-[10px] text-muted-foreground/40">
-              PawFeed · Alpha-Test · © {new Date().getFullYear()}
+              PawFeed · V1.0.0-rc · © {new Date().getFullYear()}
             </p>
           </div>
         </>