Enhanced xlsxwriter scripts with comprehensive store_name replacement and ArrayFormula support

- Added create_excel_xlsxwriter.py and update_excel_xlsxwriter.py
- Implemented comprehensive store_name replacement across all formula types
- Added special handling for ArrayFormula objects (H25-AG27 range)
- Added external link breaking to prevent Excel security warnings
- Enhanced sheet renaming with formula reference preservation
- Updated server.js to use new xlsxwriter scripts

🤖 Generated with [Claude Code](https://claude.ai/code)

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

config.json

@@ -5,7 +5,7 @@
     "company_name": "footprints",
     "email": "test@test.ro",
     "phone": "1231231231",
-    "store_name": "TEST",
+    "store_name": "TEST5",
     "country": "Romania",
     "starting_date": "2026-01-01",
     "duration": 36,