任务系统一半多，商城筛选功能，一些细节和免费包

Assets/scripts/gamePlay_gameplay/GameManager.cs

@@ -1636,6 +1636,16 @@ public class GameManager : MonoBehaviour
     /// Records the elapsed play time since the session started and adds it to the song's total play time.
     /// Can be called multiple times, but only records once per session.
     /// </summary>
+    public float GetPendingSessionDurationSeconds()
+    {
+        if (timeRecorded || currentSong == null || GameConfig.autoPlayEnabled)
+        {
+            return 0f;
+        }
+
+        return Mathf.Max(0f, Time.realtimeSinceStartup - sessionStartTime);
+    }
+
     public void RecordTotalPlayTime()
     {
         if (timeRecorded || currentSong == null || GameConfig.autoPlayEnabled) return;