chore: update task group configuration and add parallel build task

.vscode/tasks.json

@@ -11,7 +11,10 @@
         "--release",
         "--dart-define-from-file=.env/flutter_defines.json"
       ],
-      "group": "build",
+      "group": {
+        "kind": "build",
+        "isDefault": true
+      },
       "problemMatcher": []
     },
     {
@@ -39,6 +42,16 @@
       ],
       "group": "build",
       "problemMatcher": []
+    },
+    {
+      "label": "Flutter Build All Release (Parallel)",
+      "dependsOn": [
+        "Flutter Build APK (Release)",
+        "Flutter Build App Bundle (Release)",
+        "Flutter Build iOS IPA (Release)"
+      ],
+      "dependsOrder": "parallel",
+      "problemMatcher": []
     }
   ]
 }