feat: demo space improvements — description + sorted listing

- Add description to demo space seed for context in the UI
- Sort spaces API: user's own spaces first, then demo, then alphabetical

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

server/seed-demo.ts

@@ -773,7 +773,9 @@ export async function ensureDemoCommunity(): Promise<void> {
 	const exists = await communityExists("demo");
 
 	if (!exists) {
-		await createCommunity("r* Ecosystem Demo", "demo", null, "public");
+		await createCommunity("r* Ecosystem Demo", "demo", null, "public", {
+			description: "Public demo space showcasing all rStack apps with the Alpine Explorer 2026 scenario",
+		});
 		console.log("[Demo] Created demo community with visibility: public");
 	} else {
 		await loadCommunity("demo");

server/spaces.ts

@@ -84,6 +84,15 @@ spaces.get("/", async (c) => {
 		}
 	}
 
+	// Sort: user's own spaces first, then demo, then others alphabetically
+	spacesList.sort((a, b) => {
+		if (a.role && !b.role) return -1;
+		if (!a.role && b.role) return 1;
+		if (a.slug === "demo") return -1;
+		if (b.slug === "demo") return 1;
+		return a.name.localeCompare(b.name);
+	});
+
 	return c.json({ spaces: spacesList });
 });