feat(dev): add dev.asepharyana.my.id Caddy route → 127.0.0.1:3000

Ephemeral dev preview of the Next.js template — no systemd service; dev
server runs on-demand (bun run dev), Caddy routes :3000, 502s when stopped.

infra/caddy/Caddyfile.prod

@@ -179,3 +179,7 @@ mcp.asepharyana.my.id {
 hamc.asepharyana.my.id {
 	import proxy 4023
 }
+
+dev.asepharyana.my.id {
+	import proxy 3000
+}