feat: Add WorldStateFlagAttribute and custom property drawer for enhanced dialogue management

- Implemented WorldStateFlagAttribute to mark string fields as world state flags.
- Created NarrativeNPCEditor for custom inspector to visualize dialogue version activation states.
- Developed WorldStateFlagDrawer to provide dropdown menu for known flags in the inspector.
- Introduced ActorModule for managing DialogueActorSO assets, including viewing, creating, and deleting actors.
- Added DialogueModule for managing DialogueSequenceSO assets with detailed previews and action bars.
- Established QuestModule for managing QuestSO assets, including objectives and branches.
- Implemented QuestManagerPostprocessor to automatically refresh QuestManager's quest list on asset changes.

Assets/_Game/Scripts/Quest/QuestGiver.cs

@@ -27,7 +27,7 @@ namespace BaseGames.Quest
         protected override void Interact_Internal(Transform player)
         {
             var qm    = SL.GetOrDefault<IQuestManager>();
-            var quest = GetCurrentQuest(qm);
+            var quest = GetCurrentOrCompletedQuest(qm);
             if (quest == null || qm == null) return;
 
             var state = qm.GetState(quest.questId);
@@ -36,7 +36,7 @@ namespace BaseGames.Quest
             {
                 qm.AcceptQuest(quest.questId);
             }
-            else if (qm.IsReadyToComplete(quest.questId))
+            else if (state == QuestStateEnum.Active && qm.IsReadyToComplete(quest.questId))
             {
                 // 直接从 player 获取 PlayerStats，避免对 PlayerController 的程序集依赖
                 var stats = player.GetComponentInParent<PlayerStats>();
@@ -47,7 +47,7 @@ namespace BaseGames.Quest
         protected override DialogueSequenceSO GetCurrentDialogue()
         {
             var qm    = SL.GetOrDefault<IQuestManager>();
-            var quest = GetCurrentQuest(qm);
+            var quest = GetCurrentOrCompletedQuest(qm);
             if (quest == null || qm == null) return base.GetCurrentDialogue();
 
             var state = qm.GetState(quest.questId);
@@ -64,19 +64,25 @@ namespace BaseGames.Quest
 
         // ── 私有辅助 ─────────────────────────────────────────────────────────
 
-        /// <summary>返回当前处于 Available 或 Active 状态的第一个任务。</summary>
-        private QuestSO GetCurrentQuest(IQuestManager qm = null)
+        /// <summary>
+        /// 返回当前处于 Available 或 Active 状态的第一个任务；
+        /// 若全部已完成，返回最后一个已完成任务（用于显示 completedDialogue）。
+        /// </summary>
+        private QuestSO GetCurrentOrCompletedQuest(IQuestManager qm = null)
         {
             if (_offeredQuests == null) return null;
             qm ??= SL.GetOrDefault<IQuestManager>();
             if (qm == null) return null;
+
+            QuestSO lastCompleted = null;
             foreach (var q in _offeredQuests)
             {
                 if (q == null) continue;
                 var s = qm.GetState(q.questId);
                 if (s == QuestStateEnum.Available || s == QuestStateEnum.Active) return q;
+                if (s == QuestStateEnum.Completed) lastCompleted = q;
             }
-            return null;
+            return lastCompleted;
         }
     }
 }