Add rollback/undo functionality for furniture imports

- Added LogsFurniImports table to track import history with rollback support
- Implemented rollbackFurniImport() service function to revert imports:
  - Removes items from items_base, catalog_items, FurnitureData.json
  - Deletes asset files (SWF, Nitro, icons) and mirror copies
  - Marks import log as rolled back
- Added DELETE /api/admin/import/furni?importId=X endpoint
- Added dry-run support for import validation (?dryrun=1)
- Added updateExisting option to update existing catalog entries
- All TypeScript/Biome checks pass, tests pass (806 passed, 1 pre-existing skip)

src/db/schema.ts

@@ -391,6 +391,20 @@ export const LogsShopPurchases = mysqlTable("logs_shop_purchases", {
 	amount: int("amount"),
 });
 
+export const LogsFurniImports = mysqlTable("logs_furni_imports", {
+	id: int("id", { unsigned: true }).autoincrement().primaryKey().notNull(),
+	timestamp: int("timestamp", { unsigned: true }).notNull(),
+	userId: int("user_id").notNull(),
+	batch: tinyint("batch").notNull().default(0),
+	totalItems: int("total_items").notNull().default(0),
+	succeeded: int("succeeded").notNull().default(0),
+	failed: int("failed").notNull().default(0),
+	details: text("details").notNull(),
+	rolledBack: tinyint("rolled_back").notNull().default(0),
+	rolledBackAt: int("rolled_back_at", { unsigned: true }),
+	rolledBackBy: int("rolled_back_by"),
+});
+
 export const MarketplaceItems = mysqlTable("marketplace_items", {
 	id: int("id").autoincrement().primaryKey().notNull(),
 	itemId: int("item_id").notNull(),