fix(dashboard): remove the unnecessary blank on api config page

ui/src/pages/api.tsx

@@ -206,7 +206,7 @@ export function ApiPage() {
   };
 
   return (
-    <div className="h-[calc(100vh-100px)] flex flex-col">
+    <div className="h-full flex flex-col">
       <OpenRouterBanner onCreateClick={() => setCreateDialogOpen(true)} />
       <div className="flex-1 flex min-h-0">
         <div className="w-80 border-r flex flex-col bg-muted/30">