refactor: Reorganize datamate-python (#34)

refactor: Reorganize datamate-python (previously label-studio-adapter) into a DDD style structure.

runtime/datamate-python/app/module/dataset/schema/dataset_file.py

@@ -0,0 +1,26 @@
+from pydantic import BaseModel, Field
+from typing import List, Optional, Dict, Any
+from datetime import datetime
+
+class DatasetFileResponse(BaseModel):
+    """DM服务数据集文件响应模型"""
+    id: str = Field(..., description="文件ID")
+    fileName: str = Field(..., description="文件名")
+    fileType: str = Field(..., description="文件类型")
+    filePath: str = Field(..., description="文件路径")
+    originalName: Optional[str] = Field(None, description="原始文件名")
+    size: Optional[int] = Field(None, description="文件大小（字节）")
+    status: Optional[str] = Field(None, description="文件状态")
+    uploadedAt: Optional[datetime] = Field(None, description="上传时间")
+    description: Optional[str] = Field(None, description="文件描述")
+    uploadedBy: Optional[str] = Field(None, description="上传者")
+    lastAccessTime: Optional[datetime] = Field(None, description="最后访问时间")
+
+class PagedDatasetFileResponse(BaseModel):
+    """DM服务分页文件响应模型"""
+    content: List[DatasetFileResponse] = Field(..., description="文件列表")
+    totalElements: int = Field(..., description="总元素数")
+    totalPages: int = Field(..., description="总页数")
+    page: int = Field(..., description="当前页码")
+    size: int = Field(..., description="每页大小")
+