chore: add husky pre-commit hook and lint-staged configuration

- Created a pre-commit hook in .husky to run lint-staged.
- Added .lintstagedrc.mjs to format frontend files with Prettier and apply Spotless to backend Java files.
- Introduced .prettierignore to exclude specific directories from formatting.

frontend/.vscode/extensions.json

@@ -1,4 +1,4 @@
 {
-  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=827846
-  "recommendations": ["angular.ng-template"]
+	// For more information, visit: https://go.microsoft.com/fwlink/?linkid=827846
+	"recommendations": ["angular.ng-template"]
 }