Add xlsxwriter-based Excel generation scripts with openpyxl implementation

- Created create_excel_xlsxwriter.py and update_excel_xlsxwriter.py
- Uses openpyxl exclusively to preserve Excel formatting and formulas
- Updated server.js to use new xlsxwriter scripts for form submissions
- Maintains all original functionality while ensuring proper Excel file handling

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

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

venv/lib/python3.12/site-packages/openpyxl/utils/escape.py

@@ -0,0 +1,43 @@
+# Copyright (c) 2010-2024 openpyxl
+
+"""
+OOXML has non-standard escaping for characters < \031
+"""
+
+import re
+
+
+def escape(value):
+    r"""
+    Convert ASCII < 31 to OOXML: \n == _x + hex(ord(\n)) + _
+    """
+
+    CHAR_REGEX = re.compile(r"[\001-\031]")
+
+    def _sub(match):
+        """
+        Callback to escape chars
+        """
+        return "_x{:0>4x}_".format(ord(match.group(0)))
+
+    return CHAR_REGEX.sub(_sub, value)
+
+
+def unescape(value):
+    r"""
+    Convert escaped strings to ASCIII: _x000a_ == \n
+    """
+
+
+    ESCAPED_REGEX = re.compile("_x([0-9A-Fa-f]{4})_")
+
+    def _sub(match):
+        """
+        Callback to unescape chars
+        """
+        return chr(int(match.group(1), 16))
+
+    if "_x" in value:
+        value = ESCAPED_REGEX.sub(_sub, value)
+
+    return value