feat(prelude): hide slot render shortcut

Keep the beginner prelude on generated lower-aware render/html paths instead of exposing RenderSlotExt, which can bypass generated runtime metadata.

req: dx/006

req: component/003

req: runtime/001

slhx/src/lib.rs

@@ -84,7 +84,7 @@ pub mod prelude {
         CssClasses, Effect, EventName, Form, FormModel, FormValue, Handle, IntoEffect, KeyedSlot,
         ParamName, SafeHtml, Slot,
     };
-    pub use crate::{render, render_html, RenderKeyedSlotExt, RenderSlotExt};
+    pub use crate::{render, render_html, RenderKeyedSlotExt};
     pub use slhx_derive::{app, component, form, handler, surface};
 }