feat: Update Show page to link to Performance details instead of Song

frontend/app/shows/[id]/page.tsx

@@ -173,7 +173,7 @@ export default async function ShowDetailPage({ params }: { params: Promise<{ id:
                                                                 <span className="text-muted-foreground/60 w-6 text-right text-xs font-mono">{perf.position}.</span>
                                                                 <div className="font-medium flex items-center gap-2">
                                                                     <Link
-                                                                        href={`/songs/${perf.song?.slug || perf.song?.id}`}
+                                                                        href={`/performances/${perf.slug || perf.id}`}
                                                                         className="hover:text-primary hover:underline transition-colors"
                                                                     >
                                                                         {perf.song?.title || "Unknown Song"}