Import initail de calcul-astreintes v0.9.4 pour passage en paycheck 1.0

.gitignore

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+# --- Build / Wails ---
+bin/
+build/
+dist/
+*.exe
+*.app
+*.dmg
+!build/appicon.png
+!build/windows/
+!build/windows/icon.ico
+
+# Wails generated
+# frontend/src/wailsjs/
+
+# --- Node ---
+frontend/node_modules/
+frontend/dist/*
+!frontend/dist/.keep
+frontend/.vite/
+
+# --- Archives / exports lourds ---
+*.zip
+*.tar
+*.tar.gz
+*.7z
+
+# --- PDF / exports ---
+*.pdf
+
+# --- Diffs / patches ---
+*.diff
+*.patch
+
+# --- OS / IDE ---
+.DS_Store
+Thumbs.db
+.vscode/
+.idea/