feat: Round 48 narrative systems improvements

- QuestSO: Add ValidateBranchCycles() DFS detection for branches[].nextQuest loop
- QuestSO: Mark three legacy prerequisite fields with v2.0 removal warning in Tooltip
- IQuestManager: Add QuestLockReason enum + QuestLockInfo struct (strongly-typed lock info)
- IQuestManager: Add GetQuestLockInfo() method to interface; GetQuestLockReason() now delegates to it
- IQuestEventSource: Add OnQuestStateChanged(questId, oldState, newState) unified event
- QuestManager: Implement GetQuestLockInfo(); fire OnQuestStateChanged on all state transitions
- DialogueManager: Add one-frame yield in HandleChoices before ShowChoices (skip-debounce fix)
- DialogueManager: Increment _playbackId in ForceEnd() to invalidate residual choice callbacks
- DialogueSequenceSO: Add UNITY_EDITOR debug log in TryGetActiveVariant on variant match
- WorldStateRegistry: Add OnBatchStateChanged event + BatchMark() batch-write API
- DialogueModule: List badge shows warning indicator for unconditional-shadowing variants
- DialogueModule: BuildVariantsCard shows logic mode (AND/OR) alongside flag conditions

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

Assets/_Game/Scripts/World/TriggerZone.cs

@@ -0,0 +1,76 @@
+using BaseGames.Core.Events;
+using UnityEngine;
+
+namespace BaseGames.World
+{
+    /// <summary>
+    /// 区域到达触发器（架构 22_QuestChallengeModule §3 扩展）。
+    /// 挂在场景中的 2D 触发碰撞体上，玩家进入时广播 EVT_AreaReached 事件，
+    /// 驱动 ReachAreaObjective（markerTag 模式）的任务目标进度。
+    ///
+    /// 使用方式：
+    ///   1. 在目标区域创建空 GameObject，添加 Collider2D（勾选 IsTrigger）。
+    ///   2. 挂上 TriggerZone，填写 markerTag（与 ReachAreaObjective.markerTag 保持一致）。
+    ///   3. 将 EVT_AreaReached 事件频道资产拖入 _onAreaReached 字段。
+    ///   4. 将 QuestManager 同一 _onAreaReached 频道字段也引用同一资产即可联通。
+    /// </summary>
+    [RequireComponent(typeof(Collider2D))]
+    public class TriggerZone : MonoBehaviour
+    {
+        [Header("区域标识")]
+        [Tooltip("区域唯一标记（如 \"ZONE_ForestEntry\"）。需与 ReachAreaObjective.markerTag 保持完全一致。")]
+        [SerializeField] private string _markerTag;
+
+        [Tooltip("触发后是否只生效一次（推荐勾选，防止重复广播）。")]
+        [SerializeField] private bool _triggerOnce = true;
+
+        [Header("玩家层级")]
+        [Tooltip("玩家所在的物理层，用于过滤非玩家碰撞体进入。只有属于此层的碰撞体才触发广播。")]
+        [SerializeField] private LayerMask _playerLayer;
+
+        [Header("事件频道")]
+        [Tooltip("EVT_AreaReached 事件频道（StringEventChannelSO）。触发时以 markerTag 为 payload 广播。\n" +
+                 "需与 QuestManager._onAreaReached 字段引用同一资产。")]
+        [SerializeField] private StringEventChannelSO _onAreaReached;
+
+        private bool _triggered;
+
+        /// <summary>区域唯一标记（只读）。供编辑器工具（QuestModule 批量验证）交叉比对使用。</summary>
+        public string MarkerTag => _markerTag;
+
+        private void OnTriggerEnter2D(Collider2D other)
+        {
+            if (_triggered) return;
+            if (string.IsNullOrEmpty(_markerTag)) return;
+            if (((1 << other.gameObject.layer) & _playerLayer.value) == 0) return;
+
+            _onAreaReached?.Raise(_markerTag);
+
+            if (_triggerOnce) _triggered = true;
+        }
+
+        /// <summary>重置触发状态（如读档/重新进入关卡时调用）。</summary>
+        public void ResetTrigger() => _triggered = false;
+
+#if UNITY_EDITOR
+        private void OnDrawGizmos()
+        {
+            if (string.IsNullOrEmpty(_markerTag)) return;
+            Gizmos.color = new Color(0.2f, 0.8f, 0.4f, 0.25f);
+            var col = GetComponent<Collider2D>();
+            if (col != null) Gizmos.DrawWireSphere(col.bounds.center, 0.3f);
+        }
+
+        private void OnDrawGizmosSelected()
+        {
+            var col = GetComponent<Collider2D>();
+            if (col == null) return;
+            Gizmos.color = new Color(0.2f, 0.9f, 0.4f, 0.5f);
+            Gizmos.DrawWireCube(col.bounds.center, col.bounds.size);
+            UnityEditor.Handles.Label(
+                col.bounds.center + Vector3.up * (col.bounds.extents.y + 0.2f),
+                string.IsNullOrEmpty(_markerTag) ? "(未设置 markerTag)" : _markerTag);
+        }
+#endif
+    }
+}