fix(dreamdoor): 修复星空默认开启导致变门穿帮

Co-authored-by: Cursor <cursoragent@cursor.com>

Assets/Scripts/SceneManagement/TimelineKit/StarfieldDefocusController.cs

@@ -109,6 +109,7 @@ namespace AibisDream
                 return;
             }
 
+            EnsureStarfieldActive();
             director.Stop();
             SetTimelineTime(0f);
         }
@@ -120,6 +121,8 @@ namespace AibisDream
                 yield break;
             }
 
+            EnsureStarfieldActive();
+
             float startTime;
             float endTime;
             switch (attempt)
@@ -159,6 +162,7 @@ namespace AibisDream
                 yield break;
             }
 
+            EnsureStarfieldActive();
             director.Pause();
             SetTimelineTime(blurFadeStart);
             director.Play();
@@ -195,9 +199,23 @@ namespace AibisDream
                 return;
             }
 
+            // Fiction 等路径可能只 play_timeline、不走 starfield_prepare；
+            // Timeline 只 key 了「海浪」的 Active，不会打开「星空」。
+            if (director.state == PlayState.Playing)
+                EnsureStarfieldActive();
+
             ApplyAtTime((float)director.time);
         }
 
+        /// <summary>
+        /// 场景「星空」默认 inactive（与「海浪」一致）。演出开始时打开。
+        /// </summary>
+        private void EnsureStarfieldActive()
+        {
+            if (starfieldRenderer != null && !starfieldRenderer.gameObject.activeSelf)
+                starfieldRenderer.gameObject.SetActive(true);
+        }
+
         private bool TryValidateReferences()
         {
             if (director == null)