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/QuestSO.cs

@@ -83,9 +83,14 @@ namespace BaseGames.Quest
         public RewardSO reward;
 
         [Header("失败条件（可选）")]
-        [Tooltip("勾选后，failCondition 目标一旦完成，本任务立即失败并触发 EVT_QuestFailed 事件。")]
+        [Tooltip("勾选后，failConditions 中任意一个目标完成，本任务立即失败并触发 EVT_QuestFailed 事件。")]
         public bool               canFail;
-        [Tooltip("失败判定目标。canFail=true 时有效；此目标达成即视为任务失败。")]
+        [Tooltip("失败判定目标列表（任意一个达成即失败）。canFail=true 时有效。\n" +
+                 "支持多个失败条件（如「BOSS 在限时内未被击败」OR「关键 NPC 死亡」）。")]
+        public QuestObjectiveSO[] failConditions;
+        [System.Obsolete("已废弃，请改用 failConditions（数组，支持多个失败条件）。保留以兼容现有资产序列化。")]
+        [HideInInspector]
+        [Tooltip("（旧版单一失败条件，已被 failConditions 数组取代。保留以兼容现有资产。）")]
         public QuestObjectiveSO   failCondition;
 
         [Header("接取/完成对话")]