Revert "Add missing admin action files and navigation links"

This reverts commit 41be6835bf.

src/actions/import-furni.ts

@@ -1,19 +0,0 @@
-"use server";
-
-import { requireStaff } from "@/lib/admin/guard";
-import { prisma } from "@/lib/prisma";
-
-export async function cleanSwfFiles() {
-  await requireStaff();
-  return { ok: true as const, data: { deleted: 0, remaining: 0 } };
-}
-
-export async function deleteImportedFurni({ classname }: { classname: string }) {
-  await requireStaff();
-  try {
-    await prisma.itemsBase.deleteMany({ where: { itemName: classname } });
-    return { ok: true as const, data: { deletedFiles: [classname], errors: [] as string[] } };
-  } catch {
-    return { ok: false as const, error: `Failed to delete ${classname}` };
-  }
-}