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/tasks.json

@@ -1,42 +1,42 @@
 {
-  // For more information, visit: https://go.microsoft.com/fwlink/?LinkId=733558
-  "version": "2.0.0",
-  "tasks": [
-    {
-      "type": "npm",
-      "script": "start",
-      "isBackground": true,
-      "problemMatcher": {
-        "owner": "typescript",
-        "pattern": "$tsc",
-        "background": {
-          "activeOnStart": true,
-          "beginsPattern": {
-            "regexp": "Changes detected"
-          },
-          "endsPattern": {
-            "regexp": "bundle generation (complete|failed)"
-          }
-        }
-      }
-    },
-    {
-      "type": "npm",
-      "script": "test",
-      "isBackground": true,
-      "problemMatcher": {
-        "owner": "typescript",
-        "pattern": "$tsc",
-        "background": {
-          "activeOnStart": true,
-          "beginsPattern": {
-            "regexp": "Changes detected"
-          },
-          "endsPattern": {
-            "regexp": "bundle generation (complete|failed)"
-          }
-        }
-      }
-    }
-  ]
+	// For more information, visit: https://go.microsoft.com/fwlink/?LinkId=733558
+	"version": "2.0.0",
+	"tasks": [
+		{
+			"type": "npm",
+			"script": "start",
+			"isBackground": true,
+			"problemMatcher": {
+				"owner": "typescript",
+				"pattern": "$tsc",
+				"background": {
+					"activeOnStart": true,
+					"beginsPattern": {
+						"regexp": "Changes detected"
+					},
+					"endsPattern": {
+						"regexp": "bundle generation (complete|failed)"
+					}
+				}
+			}
+		},
+		{
+			"type": "npm",
+			"script": "test",
+			"isBackground": true,
+			"problemMatcher": {
+				"owner": "typescript",
+				"pattern": "$tsc",
+				"background": {
+					"activeOnStart": true,
+					"beginsPattern": {
+						"regexp": "Changes detected"
+					},
+					"endsPattern": {
+						"regexp": "bundle generation (complete|failed)"
+					}
+				}
+			}
+		}
+	]
 }