feat: add demo seed for live ui

apps/admin-api/src/main.rs

@@ -53,6 +53,9 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     };
     let service = AdminService::new(registry, storage_root, auth_settings);
     service.bootstrap_admin_user().await?;
+    if env_flag("CRANK_DEMO_SEED") {
+        service.seed_demo_assets().await?;
+    }
     let state = AppState { service };
     let app = build_app(state);
     let listener = TcpListener::bind(socket_addr).await?;
@@ -63,3 +66,14 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     Ok(())
 }
+
+fn env_flag(name: &str) -> bool {
+    matches!(
+        env::var(name)
+            .ok()
+            .as_deref()
+            .map(str::to_ascii_lowercase)
+            .as_deref(),
+        Some("1" | "true" | "yes" | "on")
+    )
+}