feat: bare-domain module routing — rspace.online/{moduleId} as default

App dropdown links now go to rspace.online/r* (bare domain) instead of
demo.rspace.online/r*. Only the "Try Demo" button links to the explicit
demo subdomain. Server internally rewrites bare-domain module paths to
/demo/{moduleId} while preserving the browser URL.

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

server/index.ts

@@ -779,6 +779,24 @@ const server = Bun.serve<WSData>({
 			return app.fetch(rewrittenReq);
 		}
 
+		// ── Bare-domain module routes: rspace.online/{moduleId} → internal rewrite ──
+		// When on the bare domain (no subdomain), if the first path segment is a
+		// known module ID, rewrite internally to /demo/{moduleId}/... so Hono's
+		// /:space/:moduleId routes handle it. The browser URL stays as-is.
+		if (!subdomain && hostClean.includes("rspace.online")) {
+			const pathSegments = url.pathname.split("/").filter(Boolean);
+			if (pathSegments.length >= 1) {
+				const firstSegment = pathSegments[0];
+				const knownModuleIds = new Set(getAllModules().map((m) => m.id));
+				if (knownModuleIds.has(firstSegment)) {
+					const rewrittenPath = `/demo${url.pathname}`;
+					const rewrittenUrl = new URL(rewrittenPath + url.search, `http://localhost:${PORT}`);
+					const rewrittenReq = new Request(rewrittenUrl, req);
+					return app.fetch(rewrittenReq);
+				}
+			}
+		}
+
 		// ── Hono handles everything else ──
 		const response = await app.fetch(req);
 

server/shell.ts

@@ -78,7 +78,7 @@ export function renderShell(opts: ShellOptions): string {
       <rstack-mi></rstack-mi>
     </div>
     <div class="rstack-header__right">
-      ${spaceSlug !== "demo" ? `<a class="rstack-header__demo-btn" href="https://demo.rspace.online/${escapeAttr(moduleId)}">Try Demo</a>` : ""}
+      <a class="rstack-header__demo-btn" ${spaceSlug === "demo" ? 'data-hide' : ''} href="https://demo.rspace.online/${escapeAttr(moduleId)}">Try Demo</a>
       <rstack-identity></rstack-identity>
     </div>
   </header>
@@ -96,6 +96,17 @@ export function renderShell(opts: ShellOptions): string {
     // Provide module list to app switcher
     document.querySelector('rstack-app-switcher')?.setModules(${moduleListJSON});
 
+    // ── Bare-domain "Try Demo" button visibility ──
+    // On rspace.online (bare domain), the server internally rewrites to demo space,
+    // but we still want the "Try Demo" button visible since it links to the explicit demo subdomain.
+    (function() {
+      var host = window.location.host.split(':')[0];
+      if (host === 'rspace.online' || host === 'www.rspace.online') {
+        var btn = document.querySelector('.rstack-header__demo-btn');
+        if (btn) btn.removeAttribute('data-hide');
+      }
+    })();
+
     // ── Auto-space resolution ──
     // Logged-in users on demo space → redirect to personal space
     (function() {

shared/url-helpers.ts

@@ -2,6 +2,7 @@
  * Subdomain-aware URL helpers for rSpace navigation.
  *
  * Canonical URL pattern: {space}.rspace.online/{moduleId}
+ * Bare domain pattern:   rspace.online/{moduleId}  (implicitly demo space)
  * Fallback (localhost):  /{space}/{moduleId}
  */
 
@@ -17,26 +18,37 @@ export function isSubdomain(): boolean {
 	);
 }
 
+/** Detect if the current page is on the bare rspace.online domain (no subdomain) */
+export function isBareDomain(): boolean {
+	const host = window.location.host.split(":")[0];
+	return host === "rspace.online" || host === "www.rspace.online";
+}
+
 /** Get the current space from subdomain or path */
 export function getCurrentSpace(): string {
-	const hostParts = window.location.host.split(":")[0].split(".");
-	if (
-		hostParts.length >= 3 &&
-		hostParts.slice(-2).join(".") === "rspace.online" &&
-		!RESERVED_SUBDOMAINS.includes(hostParts[0])
-	) {
-		return hostParts[0];
+	if (isSubdomain()) {
+		return window.location.host.split(":")[0].split(".")[0];
 	}
+	// Bare domain: space is implicit (demo by default, until auto-provision)
+	if (isBareDomain()) {
+		return "demo";
+	}
+	// Path-based (localhost): /{space}/{moduleId}
 	const pathParts = window.location.pathname.split("/").filter(Boolean);
 	return pathParts[0] || "demo";
 }
 
-/** Get the current module from the path (works for both subdomain and path routing) */
+/** Get the current module from the path (works for subdomain, bare domain, and path routing) */
 export function getCurrentModule(): string {
 	const parts = window.location.pathname.split("/").filter(Boolean);
 	if (isSubdomain()) {
 		return parts[0] || "rspace";
 	}
+	// Bare domain: path is /{moduleId}
+	if (isBareDomain()) {
+		return parts[0] || "rspace";
+	}
+	// Path-based (localhost): /{space}/{moduleId}
 	return parts[1] || "rspace";
 }
 
@@ -45,7 +57,9 @@ export function getCurrentModule(): string {
  *
  * On subdomains: same-space links use /{moduleId}, cross-space links
  * switch the subdomain to {newSpace}.rspace.online/{moduleId}.
- * On bare domain or localhost: uses /{space}/{moduleId}.
+ * On bare domain (rspace.online): stays on bare domain as /{moduleId}
+ * for default (demo) space, subdomain for explicit spaces.
+ * On localhost: uses /{space}/{moduleId}.
  */
 export function rspaceNavUrl(space: string, moduleId: string): string {
 	const hostParts = window.location.host.split(":")[0].split(".");
@@ -64,12 +78,13 @@ export function rspaceNavUrl(space: string, moduleId: string): string {
 		return `${window.location.protocol}//${space}.${baseDomain}/${moduleId}`;
 	}
 
-	// Bare domain (rspace.online) or localhost → use /{space}/{moduleId}
-	const onRspace =
-		window.location.host.includes("rspace.online") &&
-		!window.location.host.startsWith("www");
-	if (onRspace) {
-		// Prefer subdomain routing
+	// Bare domain (rspace.online)
+	if (isBareDomain()) {
+		// Default space → stay on bare domain: /{moduleId}
+		if (space === "demo") {
+			return `/${moduleId}`;
+		}
+		// Explicit space → switch to subdomain
 		return `${window.location.protocol}//${space}.rspace.online/${moduleId}`;
 	}