feat: strip MTZ internal suffix from descriptions

Removes trailing " (NNNNN) - Country - Npcs ByBox" pattern from
product descriptions before serving to BC.

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

main.py

@@ -1,4 +1,5 @@
 import os
+import re
 import threading
 import time
 import requests
@@ -86,11 +87,12 @@ def download_and_parse():
         brand_raw = row[9]  # col J
         brand = str(brand_raw) if brand_raw is not None else ""
         min_box_raw = row[10]  # col K
+        description = re.sub(r'\s*\(\d+\).*$', '', str(row[2] or "")).strip()
         parsed.append(
             {
                 "item_code": safe_int(row[1], 0),
                 "ean": ean,
-                "description": str(row[2] or ""),
+                "description": description,
                 "price_usd": safe_float(row[4], 0.0),
                 "stock": safe_int(row[5], 0),
                 "brand": brand,