整理了初始化过程，现在更容易被继承了。

sync_state_machine/datasource/__init__.py

@@ -23,13 +23,25 @@ from .handler import (
 from .task_result import TaskResult, TaskStatus
 
 # API DataSource
-from .api import ApiClient, ApiDataSource, BaseApiHandler
+from .api import ApiClient, ApiDataSource, BaseApiHandler, register as register_api_datasource
 
-# DB DataSource
+# DB base helpers
 from .db import DbDataSource, BaseDbHandler
 
 # JSONL DataSource  
-from .jsonl import JsonlDataSource, BaseJsonlHandler
+from .jsonl import JsonlDataSource, BaseJsonlHandler, register as register_jsonl_datasource
+
+
+_BUILTIN_DATASOURCE_TYPES_REGISTERED = False
+
+
+def ensure_builtin_datasource_types_registered(*, replace: bool = False) -> None:
+    global _BUILTIN_DATASOURCE_TYPES_REGISTERED
+    if _BUILTIN_DATASOURCE_TYPES_REGISTERED and not replace:
+        return
+    register_jsonl_datasource(replace=replace)
+    register_api_datasource(replace=replace)
+    _BUILTIN_DATASOURCE_TYPES_REGISTERED = True
 
 __all__ = [
     # 基础类
@@ -46,13 +58,14 @@ __all__ = [
     "TaskResult",
     "TaskStatus",
     "ValidationResult",
+    "ensure_builtin_datasource_types_registered",
     
     # API DataSource
     "ApiClient",
     "ApiDataSource",
     "BaseApiHandler",
 
-    # DB DataSource
+    # DB base helpers
     "DbDataSource",
     "BaseDbHandler",