chore: 批量整理代码格式与优化细节

- 修复多处代码缩进、换行不规范问题
- 调整部分配置注释与字符串格式对齐
- 优化导入语句与多行表达式的排版
- 统一枚举、模型字段的注释风格
- 调整部分校验逻辑与提示文案
- 重构部分长函数参数与查询语句格式

backend/app/api/v1/module_system/dict/model.py

@@ -18,9 +18,7 @@ class DictTypeModel(ModelMixin, TenantMixin):
     __platform_data_shared__: bool = True
 
     dict_name: Mapped[str] = mapped_column(String(64), nullable=False, comment="字典名称")
-    dict_type: Mapped[str] = mapped_column(
-        String(255), nullable=False, comment="字典类型"
-    )
+    dict_type: Mapped[str] = mapped_column(String(255), nullable=False, comment="字典类型")
 
     # 关系定义
     dict_data_list: Mapped[list["DictDataModel"]] = relationship(
@@ -39,7 +37,10 @@ class DictDataModel(ModelMixin, TenantMixin):
     """
 
     __tablename__: str = "sys_dict_data"
-    __table_args__: dict[str, str] = {"comment": "字典数据表"}
+    __table_args__ = (
+        UniqueConstraint("tenant_id", "dict_type_id", "dict_value", name="uq_dict_data_value"),
+        {"comment": "字典数据表"},
+    )
     __loader_options__: list[str] = []
     __platform_data_shared__: bool = True