feat: add contract template v3 api and legacy oss migration

fastapi_modules/fastapi_leaudit/domian/Dto/contractTemplateDto.py

@@ -0,0 +1,27 @@
+from pydantic import BaseModel, Field
+
+
+class ContractTemplateListQueryDTO(BaseModel):
+    """合同模板列表查询参数。"""
+
+    keyword: str | None = Field(None, description="关键词")
+    category_id: int | None = Field(None, description="分类ID")
+    category_name: str | None = Field(None, description="分类名称")
+    file_format: str | None = Field(None, description="文件格式")
+    is_featured: bool | None = Field(None, description="是否推荐")
+    page: int = Field(1, ge=1, description="页码")
+    page_size: int = Field(12, ge=1, le=200, description="分页大小")
+    sort_by: str = Field("updated_at", description="排序字段")
+    sort_order: str = Field("desc", description="排序方向")
+
+
+class ContractTemplateSearchQueryDTO(BaseModel):
+    """合同模板搜索参数。"""
+
+    q: str = Field(..., min_length=1, description="搜索关键词")
+    category_id: int | None = Field(None, description="分类ID")
+    category_name: str | None = Field(None, description="分类名称")
+    page: int = Field(1, ge=1, description="页码")
+    page_size: int = Field(12, ge=1, le=200, description="分页大小")
+    sort_by: str = Field("updated_at", description="排序字段")
+    sort_order: str = Field("desc", description="排序方向")