Add requirements.txt and update config.json

- Added centralized requirements.txt with exact package versions
- Updated config.json with TEST9 store name
- Dependencies: openpyxl==3.1.2, python-dateutil==2.8.2

requirements.txt

@@ -0,0 +1,19 @@
+# Business Case Form - Python Dependencies
+# Generated on 2025-09-24
+
+# Core Excel manipulation library
+openpyxl==3.1.2
+
+# Date utilities for date calculations
+python-dateutil==2.8.2
+
+# Standard libraries (included with Python 3.x):
+# - json
+# - os
+# - shutil
+# - datetime
+# - re
+# - pathlib
+# - tempfile
+# - zipfile
+# - xml.etree.ElementTree