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。

backend/src/schemas/domain/divination.py

@@ -29,7 +29,9 @@ class YaoDetail(BaseModel):
 
     position: int = Field(ge=1, le=6)
     spirit_name: str = Field(alias="spiritName", min_length=1)
+    spirit_name_hant: str = Field(alias="spiritNameHant", default="")
     relation_name: str = Field(alias="relationName", min_length=1)
+    relation_name_hant: str = Field(alias="relationNameHant", default="")
     tigan_name: str = Field(alias="tiganName", min_length=1)
     element_name: str = Field(alias="elementName", min_length=1)
     is_yang: bool = Field(alias="isYang")
@@ -42,6 +44,7 @@ class FushenDetail(BaseModel):
 
     position: int = Field(ge=1, le=6)
     relation_name: str = Field(alias="relationName", min_length=1)
+    relation_name_hant: str = Field(alias="relationNameHant", default="")
     tigan_name: str = Field(alias="tiganName", min_length=1)
     element_name: str = Field(alias="elementName", min_length=1)
 
@@ -94,9 +97,11 @@ class DerivedDivinationData(BaseModel):
         alias="changedBinaryCode", min_length=6, max_length=6
     )
     gua_name: str = Field(alias="guaName", min_length=2)
+    gua_name_hant: str = Field(alias="guaNameHant", default="")
     upper_name: str = Field(alias="upperName", min_length=1)
     lower_name: str = Field(alias="lowerName", min_length=1)
     target_gua_name: str = Field(alias="targetGuaName", min_length=2)
+    target_gua_name_hant: str = Field(alias="targetGuaNameHant", default="")
     world_position: int = Field(alias="worldPosition", ge=1, le=6)
     response_position: int = Field(alias="responsePosition", ge=1, le=6)
     has_changing_yao: bool = Field(alias="hasChangingYao")