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/xlsxwriter/rich_value.py

@@ -0,0 +1,98 @@
+###############################################################################
+#
+# RichValue - A class for writing the Excel XLSX rdrichvalue.xml file.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2013-2025, John McNamara, jmcnamara@cpan.org
+#
+
+from xlsxwriter.image import Image
+
+from . import xmlwriter
+
+
+class RichValue(xmlwriter.XMLwriter):
+    """
+    A class for writing the Excel XLSX rdrichvalue.xml file.
+
+
+    """
+
+    ###########################################################################
+    #
+    # Public API.
+    #
+    ###########################################################################
+
+    def __init__(self) -> None:
+        """
+        Constructor.
+
+        """
+
+        super().__init__()
+        self.embedded_images = []
+
+    ###########################################################################
+    #
+    # Private API.
+    #
+    ###########################################################################
+
+    def _assemble_xml_file(self) -> None:
+        # Assemble and write the XML file.
+
+        # Write the XML declaration.
+        self._xml_declaration()
+
+        # Write the rvData element.
+        self._write_rv_data()
+
+        self._xml_end_tag("rvData")
+
+        # Close the file.
+        self._xml_close()
+
+    ###########################################################################
+    #
+    # XML methods.
+    #
+    ###########################################################################
+    def _write_rv_data(self) -> None:
+        # Write the <rvData> element.
+        xmlns = "http://schemas.microsoft.com/office/spreadsheetml/2017/richdata"
+
+        attributes = [
+            ("xmlns", xmlns),
+            ("count", len(self.embedded_images)),
+        ]
+
+        self._xml_start_tag("rvData", attributes)
+
+        for index, image in enumerate(self.embedded_images):
+            # Write the rv element.
+            self._write_rv(index, image)
+
+    def _write_rv(self, index, image: Image) -> None:
+        # Write the <rv> element.
+        attributes = [("s", 0)]
+        value = 5
+
+        if image.decorative:
+            value = 6
+
+        self._xml_start_tag("rv", attributes)
+
+        # Write the v elements.
+        self._write_v(index)
+        self._write_v(value)
+
+        if image.description:
+            self._write_v(image.description)
+
+        self._xml_end_tag("rv")
+
+    def _write_v(self, data) -> None:
+        # Write the <v> element.
+        self._xml_data_element("v", data)