feat(unionflow): ajout Spec-Kit, constitution, mission mutuelles

- Config Spec-Kit pour Spec-Driven Development
- CONSTITUTION.md + .specify/memory/constitution.md
- Commandes Cursor /speckit.*, règles projet
- Mission: associations + mutuelles d'épargne et de financement
- .gitignore: versionner config spec-kit unionflow

Made-with: Cursor

unionflow/unionflow-mobile-apps/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>