fix: 修复历史卦象列表无法显示及六爻解卦提示词逻辑错误

后端 Pydantic schema 添加 Hant 繁体字段支持（guaNameHant,
targetGuaNameHant, spiritNameHant, relationNameHant），解决
DerivedDivinationData extra=forbid 拒绝 AI 输出的繁体字段导致
agent_output 解析失败、历史记录为空的问题。

六爻解卦提示词修复：增加静卦五行生克链分析、假破假空降权、
六冲中性判断、用神核对防捏造、空亡数据对照等硬约束。

前端 Dart model 同步添加 Hant 字段（反向兼容，缺省为空字符串）。

其他：硬币翻转动画修复、弹窗单按钮居中、起卦按钮布局调整、
繁体 l10n 清理、pre-commit 排除集成测试。

apps/lib/features/divination/data/models/divination_backend_models.dart

@@ -132,9 +132,11 @@ class DerivedDivinationData {
     required this.binaryCode,
     required this.changedBinaryCode,
     required this.guaName,
+    this.guaNameHant = '',
     required this.upperName,
     required this.lowerName,
     required this.targetGuaName,
+    this.targetGuaNameHant = '',
     required this.worldPosition,
     required this.responsePosition,
     required this.hasChangingYao,
@@ -154,9 +156,11 @@ class DerivedDivinationData {
       binaryCode: _requiredString(json, 'binaryCode'),
       changedBinaryCode: _requiredString(json, 'changedBinaryCode'),
       guaName: _requiredString(json, 'guaName'),
+      guaNameHant: json['guaNameHant'] as String? ?? '',
       upperName: _requiredString(json, 'upperName'),
       lowerName: _requiredString(json, 'lowerName'),
       targetGuaName: _requiredString(json, 'targetGuaName'),
+      targetGuaNameHant: json['targetGuaNameHant'] as String? ?? '',
       worldPosition: _requiredInt(json, 'worldPosition'),
       responsePosition: _requiredInt(json, 'responsePosition'),
       hasChangingYao: _requiredBool(json, 'hasChangingYao'),
@@ -176,9 +180,11 @@ class DerivedDivinationData {
   final String binaryCode;
   final String changedBinaryCode;
   final String guaName;
+  final String guaNameHant;
   final String upperName;
   final String lowerName;
   final String targetGuaName;
+  final String targetGuaNameHant;
   final int worldPosition;
   final int responsePosition;
   final bool hasChangingYao;
@@ -256,7 +262,9 @@ class YaoBackendLine {
   const YaoBackendLine({
     required this.position,
     required this.spiritName,
+    this.spiritNameHant = '',
     required this.relationName,
+    this.relationNameHant = '',
     required this.tiganName,
     required this.elementName,
     required this.isYang,
@@ -268,7 +276,9 @@ class YaoBackendLine {
     return YaoBackendLine(
       position: _requiredInt(json, 'position'),
       spiritName: _requiredString(json, 'spiritName'),
+      spiritNameHant: json['spiritNameHant'] as String? ?? '',
       relationName: _requiredString(json, 'relationName'),
+      relationNameHant: json['relationNameHant'] as String? ?? '',
       tiganName: _requiredString(json, 'tiganName'),
       elementName: _requiredString(json, 'elementName'),
       isYang: _requiredBool(json, 'isYang'),
@@ -279,7 +289,9 @@ class YaoBackendLine {
 
   final int position;
   final String spiritName;
+  final String spiritNameHant;
   final String relationName;
+  final String relationNameHant;
   final String tiganName;
   final String elementName;
   final bool isYang;