Use caddy for dev server

Caddyfile

@@ -0,0 +1,4 @@
+:2000 {
+    reverse_proxy 127.0.0.1:5173
+    reverse_proxy /api/* 127.0.0.1:3000
+  }

src/main.rs

@@ -97,8 +97,8 @@ async fn main() -> Result<(), std::io::Error> {
     }
     tracing_subscriber::fmt::init();
 
-    let app = Route::new().at("/", get(index)).at(
-        "/ws/:name",
+    let app = Route::new().at("/api/", get(index)).at(
+        "/api/ws/:name",
         get(ws.data(tokio::sync::broadcast::channel::<String>(32).0)),
     );