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/relationships.py

@@ -0,0 +1,143 @@
+###############################################################################
+#
+# Relationships - A class for writing the Excel XLSX Worksheet file.
+#
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright (c) 2013-2025, John McNamara, jmcnamara@cpan.org
+#
+
+# Package imports.
+from . import xmlwriter
+
+# Long namespace strings used in the class.
+SCHEMA_ROOT = "http://schemas.openxmlformats.org"
+PACKAGE_SCHEMA = SCHEMA_ROOT + "/package/2006/relationships"
+DOCUMENT_SCHEMA = SCHEMA_ROOT + "/officeDocument/2006/relationships"
+
+
+class Relationships(xmlwriter.XMLwriter):
+    """
+    A class for writing the Excel XLSX Relationships file.
+
+
+    """
+
+    ###########################################################################
+    #
+    # Public API.
+    #
+    ###########################################################################
+
+    def __init__(self) -> None:
+        """
+        Constructor.
+
+        """
+
+        super().__init__()
+
+        self.relationships = []
+        self.id = 1
+
+    ###########################################################################
+    #
+    # Private API.
+    #
+    ###########################################################################
+
+    def _assemble_xml_file(self) -> None:
+        # Assemble and write the XML file.
+
+        # Write the XML declaration.
+        self._xml_declaration()
+
+        self._write_relationships()
+
+        # Close the file.
+        self._xml_close()
+
+    def _add_document_relationship(self, rel_type, target, target_mode=None) -> None:
+        # Add container relationship to XLSX .rels xml files.
+        rel_type = DOCUMENT_SCHEMA + rel_type
+
+        self.relationships.append((rel_type, target, target_mode))
+
+    def _add_package_relationship(self, rel_type, target) -> None:
+        # Add container relationship to XLSX .rels xml files.
+        rel_type = PACKAGE_SCHEMA + rel_type
+
+        self.relationships.append((rel_type, target, None))
+
+    def _add_ms_package_relationship(self, rel_type, target) -> None:
+        # Add container relationship to XLSX .rels xml files. Uses MS schema.
+        schema = "http://schemas.microsoft.com/office/2006/relationships"
+        rel_type = schema + rel_type
+
+        self.relationships.append((rel_type, target, None))
+
+    def _add_rich_value_relationship(self) -> None:
+        # Add RichValue relationship to XLSX .rels xml files.
+        schema = "http://schemas.microsoft.com/office/2022/10/relationships/"
+        rel_type = schema + "richValueRel"
+        target = "richData/richValueRel.xml"
+        self.relationships.append((rel_type, target, None))
+
+        schema = "http://schemas.microsoft.com/office/2017/06/relationships/"
+        rel_type = schema + "rdRichValue"
+        target = "richData/rdrichvalue.xml"
+        self.relationships.append((rel_type, target, None))
+
+        rel_type = schema + "rdRichValueStructure"
+        target = "richData/rdrichvaluestructure.xml"
+        self.relationships.append((rel_type, target, None))
+
+        rel_type = schema + "rdRichValueTypes"
+        target = "richData/rdRichValueTypes.xml"
+        self.relationships.append((rel_type, target, None))
+
+    def _add_feature_bag_relationship(self) -> None:
+        # Add FeaturePropertyBag relationship to XLSX .rels xml files.
+        schema = "http://schemas.microsoft.com/office/2022/11/relationships/"
+        rel_type = schema + "FeaturePropertyBag"
+        target = "featurePropertyBag/featurePropertyBag.xml"
+        self.relationships.append((rel_type, target, None))
+
+    ###########################################################################
+    #
+    # XML methods.
+    #
+    ###########################################################################
+
+    def _write_relationships(self) -> None:
+        # Write the <Relationships> element.
+        attributes = [
+            (
+                "xmlns",
+                PACKAGE_SCHEMA,
+            )
+        ]
+
+        self._xml_start_tag("Relationships", attributes)
+
+        for relationship in self.relationships:
+            self._write_relationship(relationship)
+
+        self._xml_end_tag("Relationships")
+
+    def _write_relationship(self, relationship) -> None:
+        # Write the <Relationship> element.
+        rel_type, target, target_mode = relationship
+
+        attributes = [
+            ("Id", "rId" + str(self.id)),
+            ("Type", rel_type),
+            ("Target", target),
+        ]
+
+        self.id += 1
+
+        if target_mode:
+            attributes.append(("TargetMode", target_mode))
+
+        self._xml_empty_tag("Relationship", attributes)