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/Quest/NpcAffinityEvent.cs

@@ -0,0 +1,27 @@
+using UnityEngine;
+using BaseGames.Core.Events;
+
+namespace BaseGames.Quest
+{
+    /// <summary>
+    /// NPC 好感度变化事件的强类型负载。
+    /// 替代原 "npcId|delta" 字符串分割方案，杜绝接收方 Split 解析脆弱性。
+    /// </summary>
+    [System.Serializable]
+    public struct NpcAffinityEvent
+    {
+        /// <summary>发生好感度变化的 NPC ID（与 QuestSO.giverNpcId 保持一致）。</summary>
+        public string npcId;
+        /// <summary>好感度变化量（正值=增加，负值=减少）。</summary>
+        public int    delta;
+        /// <summary>变化后的当前总好感度数值。</summary>
+        public int    newTotal;
+    }
+
+    /// <summary>
+    /// EVT_NpcAffinityChanged 专用事件频道 SO（强类型，负载 <see cref="NpcAffinityEvent"/>）。
+    /// 放置路径: Assets/ScriptableObjects/Events/EVT_NpcAffinityChanged.asset
+    /// </summary>
+    [CreateAssetMenu(menuName = "BaseGames/Events/NpcAffinity")]
+    public class NpcAffinityEventChannelSO : BaseEventChannelSO<NpcAffinityEvent> { }
+}