[studio] add CreateJobModal stub for parallel feature units

apps/fastvideo_studio/src/components/CreateJobModal.tsx

@@ -0,0 +1,18 @@
+'use client';
+
+import type { JobType } from '@/lib/types';
+
+// Stub — replaced by unit L2 with the full create-job modal.
+// The prop signature is a hard contract: L1's CreateJobButton renders this,
+// and L2's implementation must accept exactly these props.
+export interface CreateJobModalProps {
+  isOpen: boolean;
+  onClose: () => void;
+  onSuccess: () => void;
+  jobType: JobType;
+  workloadType: string;
+}
+
+export default function CreateJobModal(_props: CreateJobModalProps) {
+  return null;
+}