chore: add Justfile, apply clippy fixes, add frontend type checking

- Add Justfile with comprehensive development workflow commands (check,
lint, build, docker, etc.)
- Add @astrojs/check and typescript dependencies for frontend type
checking

src/main.rs

@@ -393,7 +393,11 @@ async fn main() {
     tracing_subscriber::fmt()
         .with_env_filter(EnvFilter::new(format!(
             "info,dynamic_preauth={}",
-            if cfg!(debug_assertions) { "debug" } else { "info" }
+            if cfg!(debug_assertions) {
+                "debug"
+            } else {
+                "info"
+            }
         )))
         .init();