fix(routing): redirect module-as-subdomain to demo instead of treating as space

rcred.rspace.online was being treated as a space slug, triggering
auto-provision + redirect to /rspace. Now any subdomain matching a
known module ID (rcred, rvote, etc.) redirects to demo.rspace.online/{moduleId}.

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

server/index.ts

@@ -4070,6 +4070,14 @@ const server = Bun.serve<WSData>({
 
 		// ── Subdomain routing: {space}.rspace.online/{moduleId}/... ──
 		if (subdomain) {
+			// ── Guard: module IDs are not space slugs ──
+			// Redirect rcred.rspace.online → demo.rspace.online/rcred (not a space)
+			const allModuleIds = new Set(getAllModules().map(m => m.id));
+			if (allModuleIds.has(subdomain.toLowerCase())) {
+				const pathSuffix = url.pathname === "/" ? "" : url.pathname;
+				return Response.redirect(`${proto}//demo.rspace.online/${subdomain}${pathSuffix}${url.search}`, 302);
+			}
+
 			// ── Auto-provision personal space on first visit ──
 			// Fast path: communityExists is an in-memory Map check for cached spaces.
 			if (!(await communityExists(subdomain))) {