fix: VIM_URL as runtime server-side env var (not build-time NEXT_PUBLIC_)

src/app/(modules)/visual-copilot/page.tsx

@@ -1,5 +1,7 @@
+// Server Component — citește VIM_URL la runtime (nu la build time)
 import { VisualCopilotModule } from "@/modules/visual-copilot";
 
 export default function VisualCopilotPage() {
-  return <VisualCopilotModule />;
+  const url = process.env.VIM_URL ?? "";
+  return <VisualCopilotModule url={url} />;
 }