refactor: remove --csv arg from delete, auto-pick latest backup

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/order_bak/cli.py

@@ -63,14 +63,18 @@ def backup(ctx, days, scan_path):
 
 
 @main.command()
-@click.option("--csv", "csv_path", required=True, type=click.Path(exists=True), help="Path to backup CSV to delete")
 @click.pass_context
-def delete(ctx, csv_path):
+def delete(ctx):
     cfg = load_config(ctx.obj["config_path"])
     from azure.data.tables import TableClient
     from order_bak.delete import delete_orders
 
-    csv_file = Path(csv_path)
+    backup_dir = Path("./backups")
+    backup_files = sorted(backup_dir.glob("*.csv"))
+    if not backup_files:
+        click.echo("No backup files found in ./backups")
+        raise SystemExit(1)
+    csv_file = backup_files[-1]
 
     import csv as csv_mod
     with open(csv_file, newline="") as f: