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/src/app/components/apartment-form/apartment-form.css

@@ -1,29 +1,29 @@
 :host {
-  display: block;
+	display: block;
 }
 .form-actions {
-  margin-top: 28px;
+	margin-top: 28px;
 }
 .form-section + .form-section {
-  margin-top: 30px;
-  padding-top: 28px;
-  border-top: 1px solid var(--border);
+	margin-top: 30px;
+	padding-top: 28px;
+	border-top: 1px solid var(--border);
 }
 .section-heading {
-  margin-bottom: 20px;
+	margin-bottom: 20px;
 }
 .section-heading h2 {
-  margin: 0 0 4px;
-  font-size: 1rem;
+	margin: 0 0 4px;
+	font-size: 1rem;
 }
 .section-heading p {
-  margin: 0;
-  color: var(--text-muted);
-  font-size: 0.8rem;
-  line-height: 1.6;
+	margin: 0;
+	color: var(--text-muted);
+	font-size: 0.8rem;
+	line-height: 1.6;
 }
 @media (min-width: 1180px) {
-  .form-page {
-    max-width: 980px;
-  }
+	.form-page {
+		max-width: 980px;
+	}
 }