feat(workshop): add role badges and streamline theme cards

Use the service owner, moderator, or supporter role for author badges, expose downloads for owned legacy themes, and move secondary card actions into a menu. Include theme tags in publish metadata and keep API 2.0 exports limited to theme.json and assets.

src/lib/communityThemes.ts

@@ -9,6 +9,7 @@ export interface CommunityThemeAuthor {
   id: number;
   name: string;
   donor: boolean;
+  role?: 'owner' | 'moderator' | 'supporter' | null;
   avatarUrl: string;
 }