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/.prettierrc

@@ -1,12 +1,20 @@
 {
-  "printWidth": 100,
-  "singleQuote": true,
-  "overrides": [
-    {
-      "files": "*.html",
-      "options": {
-        "parser": "angular"
-      }
-    }
-  ]
+	"useTabs": true,
+	"tabWidth": 4,
+	"printWidth": 100,
+	"singleQuote": true,
+	"overrides": [
+		{
+			"files": "**/*.{yml,yaml}",
+			"options": {
+				"useTabs": false
+			}
+		},
+		{
+			"files": "*.html",
+			"options": {
+				"parser": "angular"
+			}
+		}
+	]
 }