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/exceptions.py

@@ -0,0 +1,31 @@
+"""
+自定义异常类定义
+"""
+
+class LabelStudioAdapterException(Exception):
+    """Label Studio Adapter 基础异常类"""
+    pass
+
+class DatasetMappingNotFoundError(LabelStudioAdapterException):
+    """数据集映射未找到异常"""
+    def __init__(self, mapping_id: str):
+        self.mapping_id = mapping_id
+        super().__init__(f"Dataset mapping not found: {mapping_id}")
+
+class NoDatasetInfoFoundError(LabelStudioAdapterException):
+    """无法获取数据集信息异常"""
+    def __init__(self, dataset_uuid: str):
+        self.dataset_uuid = dataset_uuid
+        super().__init__(f"Failed to get dataset info: {dataset_uuid}")
+
+class LabelStudioClientError(LabelStudioAdapterException):
+    """Label Studio 客户端错误"""
+    pass
+
+class DMServiceClientError(LabelStudioAdapterException):
+    """DM 服务客户端错误"""
+    pass
+
+class SyncServiceError(LabelStudioAdapterException):
+    """同步服务错误"""
+    pass