Initial commit: Flutter app + PHP/MySQL backend on Hostinger

Replaces Firebase with a self-hosted PHP/MySQL API served from
winded.prymsolutions.com. Includes full backend (schema, auth, events,
teams, brackets, suggestions, stats, media, file upload) and updated
Flutter repositories and domain models.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/features/media/domain/media_link.dart

@@ -0,0 +1,36 @@
+/// Social platforms surfaced on the Media screen. The enum values are stable
+/// identifiers used for icon mapping and snackbar copy.
+enum SocialPlatform { instagram, youtube, twitter, tiktok }
+
+/// Immutable domain model for a single social media link card on the Media
+/// screen. Pairs a [platform] with the community's [handle], a deep [url],
+/// and a friendly [displayName].
+class MediaLink {
+  const MediaLink({
+    required this.platform,
+    required this.handle,
+    required this.url,
+    required this.displayName,
+  });
+
+  final SocialPlatform platform;
+  final String handle;
+  final String url;
+  final String displayName;
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+    if (other is! MediaLink) return false;
+    return other.platform == platform &&
+        other.handle == handle &&
+        other.url == url &&
+        other.displayName == displayName;
+  }
+
+  @override
+  int get hashCode => Object.hash(platform, handle, url, displayName);
+
+  @override
+  String toString() => 'MediaLink($platform, $handle)';
+}