[ADD] survey_xlsx_expand_multiple_choice, survey_xlsx_extra_fields

survey_xlsx_expand_multiple_choice: expand multiple_choice questions into
one Oui/Non column per option, and matrix questions into one column per
row (value = selected option). Relies on the extension hooks added to
survey_xlsx.

survey_xlsx_extra_fields: bridge (auto_install) with survey_extra_fields
that excludes 'file' question types from the XLSX export.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

survey_xlsx_extra_fields/report/__init__.py

@@ -0,0 +1 @@
+from . import report_survey_xlsx

survey_xlsx_extra_fields/report/report_survey_xlsx.py

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+# Copyright 2025 Elabore
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+from odoo import models
+
+
+class ReportSurveyXlsx(models.AbstractModel):
+    _inherit = "report.survey.xlsx"
+
+    def _write_question_header(self, sheet, question, cols, bold):
+        # "file" questions store uploaded attachments that cannot be rendered
+        # in a spreadsheet cell: skip them so no column is created. Without a
+        # column, _process_user_answer ignores their answers automatically.
+        if question.question_type == "file":
+            return
+        return super()._write_question_header(sheet, question, cols, bold)