[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/__manifest__.py

@@ -0,0 +1,19 @@
+# Copyright 2025 Elabore
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+{
+    "name": "Survey XLSX - Extra Fields Bridge",
+    "summary": """
+        Excludes 'file' question types from the survey XLSX export""",
+    "version": "18.0.1.0.0",
+    "license": "AGPL-3",
+    "installable": True,
+    "application": False,
+    "auto_install": True,
+    "author": "Elabore",
+    "website": "https://elabore.coop",
+    "depends": [
+        "survey_xlsx_expand_multiple_choice",
+        "survey_extra_fields",
+    ],
+}