Develop labeling module (#25)

* refactor: remove db table management from LS adapter (mv to scripts later); change adapter to use the same MySQL DB as other modules.

* refactor: Rename LS Adapter module to datamate-python

runtime/datamate-python/app/models/dm/labeling_project.py

@@ -0,0 +1,26 @@
+from sqlalchemy import Column, String, Integer, JSON, TIMESTAMP
+from sqlalchemy.sql import func
+from app.db.database import Base
+import uuid
+
+class LabelingProject(Base):
+    """DM标注项目模型（原 DatasetMapping）"""
+    
+    __tablename__ = "t_dm_labeling_projects"
+    
+    id = Column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()), comment="UUID主键ID")
+    dataset_id = Column(String(36), nullable=False, comment="数据集ID")
+    name = Column(String(32), nullable=False, comment="项目名称")
+    labeling_project_id = Column(Integer, nullable=False, comment="Label Studio项目ID")
+    configuration = Column(JSON, nullable=True, comment="标签配置")
+    progress = Column(JSON, nullable=True, comment="标注进度统计")
+    created_at = Column(TIMESTAMP, server_default=func.current_timestamp(), comment="创建时间")
+    deleted_at = Column(TIMESTAMP, nullable=True, comment="删除时间（软删除）")
+    
+    def __repr__(self):
+        return f"<LabelingProject(id={self.id}, dataset_id={self.dataset_id}, name={self.name})>"
+    
+    @property
+    def is_deleted(self) -> bool:
+        """检查是否已被软删除"""
+        return self.deleted_at is not None