备份，准备做双端

Assets/scripts/gamePlay_gameplay/LevelRules/LevelRuleController.cs

@@ -37,6 +37,13 @@ public class LevelRuleController : MonoBehaviour
     private int lastEchoCastSlot = -1;
     private float lastEchoCastTime = -999f;
     private float nextConfigResolveTime;
+    // The (song, difficulty) pair we have already run FindConfig for. Lets the periodic
+    // Update skip re-resolving (and re-running Resources.LoadAll) when the current song has
+    // NO matching config — otherwise activeConfig stays null and the null-check early-out
+    // never trips, re-scanning Resources every 0.5s for the whole song.
+    private SongData resolvedForSong;
+    private int resolvedForDifficulty = -1;
+    private bool hasResolvedForCurrent;
     private int pendingSettlementScoreBonus;
     private bool handlingEnemyDamagedActions;
 
@@ -145,6 +152,7 @@ public class LevelRuleController : MonoBehaviour
     {
         ResetRuntimeState();
         nextConfigResolveTime = 0f;
+        hasResolvedForCurrent = false;
         TryResolveActiveConfig(true);
     }
 
@@ -160,10 +168,15 @@ public class LevelRuleController : MonoBehaviour
 
         SongData song = beatmapManager.assignedSongData;
         int difficulty = beatmapManager.assignedDifficulty;
-        if (!force && activeConfig != null && currentSong == song && currentDifficulty == difficulty)
+        // Skip re-resolving when we've already resolved for this exact (song, difficulty),
+        // regardless of whether a config matched (null result is still a resolved result).
+        if (!force && hasResolvedForCurrent && resolvedForSong == song && resolvedForDifficulty == difficulty)
             return;
 
         LevelRuleConfig_SO matched = FindConfig(song, difficulty);
+        resolvedForSong = song;
+        resolvedForDifficulty = difficulty;
+        hasResolvedForCurrent = true;
         SetActiveConfig(matched, song, difficulty);
     }