feat: manual creator editing on packages and bulk set

- Click creator cell in STL Files table to edit
- Server action for updating/clearing package creator
- Bulk set creator action for multiple packages

src/app/(app)/stls/actions.ts

@@ -0,0 +1,44 @@
+"use server";
+
+import { auth } from "@/lib/auth";
+import { prisma } from "@/lib/prisma";
+import type { ActionResult } from "@/types/api.types";
+import { revalidatePath } from "next/cache";
+
+export async function updatePackageCreator(
+  packageId: string,
+  creator: string | null
+): Promise<ActionResult> {
+  const session = await auth();
+  if (!session?.user?.id) return { success: false, error: "Unauthorized" };
+
+  try {
+    await prisma.package.update({
+      where: { id: packageId },
+      data: { creator: creator?.trim() || null },
+    });
+    revalidatePath("/stls");
+    return { success: true, data: undefined };
+  } catch {
+    return { success: false, error: "Failed to update creator" };
+  }
+}
+
+export async function bulkSetCreator(
+  packageIds: string[],
+  creator: string
+): Promise<ActionResult> {
+  const session = await auth();
+  if (!session?.user?.id) return { success: false, error: "Unauthorized" };
+
+  try {
+    await prisma.package.updateMany({
+      where: { id: { in: packageIds } },
+      data: { creator: creator.trim() },
+    });
+    revalidatePath("/stls");
+    return { success: true, data: undefined };
+  } catch {
+    return { success: false, error: "Failed to update creators" };
+  }
+}