feat: Round 52 narrative systems improvements

P1-A: QuestManager.OnLoad Enum.TryParse failure warning (dev builds)
P1-B: SaveData.QuestState ObjectiveCompleted dict; BuildObjectiveCompleted
       helper; OnSave/OnLoad wiring (DataVersion 2→3)
P2-A: Quest start/complete timestamps (_startedAtUtc/_completedAtUtc dicts;
       StartedAtUtc/CompletedAtUtc in SaveData; AcceptQuest/CompleteQuest/
       OnSave/OnLoad wiring)
P2-B: DialogueManager pending queue Queue→List + priority-eviction on full
       (lowest-priority item evicted when higher-priority request arrives)
P2-C: NpcSO.localizationTable field; NpcSOEditor uses npc.localizationTable
       in TryResolveNameKey, PingLocalizationFile, and button label
P3-A: QuestSO.failConditions[] multi-fail array; Obsolete failCondition;
       DispatchEvent updates fail check to any-of-array logic with fallback
P3-B: QuestObjectiveSO.prerequisiteObjectiveId; DispatchEvent gates objective
       event routing behind prerequisite completed check
P3-C: IQuestEventPayload interface + StringQuestPayload struct; QuestObjectiveSO
       typed TryHandleEvent(IQuestEventPayload) overload; DispatchEvent string
       overload delegates to typed IQuestEventPayload overload

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Assets/_Game/Scripts/Quest/QuestObjectiveSO.cs

@@ -46,6 +46,10 @@ namespace BaseGames.Quest
         public string displayTextKey;
         [Tooltip("勾选后此目标为可选项：完成可获奖励，但不阻塞任务交接。")]
         public bool   IsOptional;
+        [Tooltip("前置目标 objectiveId（留空 = 无依赖，目标与其他目标并行激活）。\n" +
+                 "设置后，在指定目标的 completed 标志置为 true 之前，本目标不接收任何事件路由，即便事件满足匹配条件。\n" +
+                 "用于实现顺序解锁的目标链（如先对话再交物品）。")]
+        public string prerequisiteObjectiveId;
 
         /// <summary>
         /// 目标所需完成数量。用于 UI 显示进度条分母（如 "3/5 击败"）。
@@ -75,6 +79,14 @@ namespace BaseGames.Quest
         public virtual bool TryHandleEvent(QuestEventType eventType, string payload, QuestObjectiveState state)
             => false;
 
+        /// <summary>
+        /// 强类型载荷重载（<see cref="IQuestEventPayload"/>）。
+        /// 默认实现委托给 string 版本（向后兼容），子类可 override 以直接消费结构化载荷，避免字符串解析。
+        /// QuestManager 优先调用此重载。
+        /// </summary>
+        public virtual bool TryHandleEvent(QuestEventType eventType, IQuestEventPayload payload, QuestObjectiveState state)
+            => TryHandleEvent(eventType, payload?.AsString(), state);
+
         /// <summary>
         /// 在 DataHub / 编辑器工具中显示的类型徽章文字。
         /// 子类应 override 返回简洁中文标签（如 "[对话]"）。