整理配置和代码入口，增加部分测试。

tests/unit/test_handler_shared_config.py

@@ -0,0 +1,86 @@
+from __future__ import annotations
+
+from typing import Any
+
+from pydantic import BaseModel
+
+from sync_state_machine.common.sync_node import SyncNode
+from sync_state_machine.datasource.api.handler import BaseApiHandler
+from sync_state_machine.datasource.handler import BaseNodeHandler, CompatibleNodeHandler
+from sync_state_machine.datasource.task_result import TaskResult
+
+
+class SharedConfigSchema(BaseModel):
+    __test__ = False
+    id: str
+
+
+class SharedConfigNode(SyncNode[SharedConfigSchema]):
+    __test__ = False
+    node_type = "shared_config_demo"
+    schema = SharedConfigSchema
+
+
+class SharedConfigBaseHandler(BaseNodeHandler[SharedConfigSchema]):
+    __test__ = False
+
+    def __init__(self) -> None:
+        super().__init__("shared_config_demo", SharedConfigNode, SharedConfigSchema)
+
+    async def load(self):
+        return []
+
+    async def create_all(self, nodes):
+        return []
+
+    async def update_all(self, nodes):
+        return []
+
+    def extract_id(self, data: dict[str, Any]) -> str:
+        return str(data.get("id", ""))
+
+
+class SharedConfigApiHandler(BaseApiHandler[SharedConfigSchema]):
+    __test__ = False
+
+    def __init__(self) -> None:
+        super().__init__()
+        self._node_type = "shared_api_demo"
+        self._node_class = SharedConfigNode
+        self._schema = SharedConfigSchema
+
+    async def load(self):
+        return []
+
+    async def create_all(self, nodes):
+        return [TaskResult.success(node_id=node.node_id) for node in nodes]
+
+    async def update_all(self, nodes):
+        return [TaskResult.success(node_id=node.node_id) for node in nodes]
+
+    async def delete_all(self, nodes):
+        return [TaskResult.success(node_id=node.node_id) for node in nodes]
+
+
+def test_base_handler_supports_shared_handler_config() -> None:
+    handler = SharedConfigBaseHandler()
+
+    handler.set_handler_config({"mode": "local", "batch_size": 10})
+
+    assert handler.handler_config == {"mode": "local", "batch_size": 10}
+
+
+def test_compatible_handler_forwards_shared_handler_config() -> None:
+    handler = CompatibleNodeHandler(SharedConfigBaseHandler())
+
+    handler.set_handler_config({"mode": "remote"})
+
+    assert handler.handler_config == {"mode": "remote"}
+
+
+def test_api_handler_supports_shared_handler_config() -> None:
+    handler = SharedConfigApiHandler()
+
+    handler.set_handler_config({"filter_project_id": ["p1", "p2"]})
+
+    assert handler.handler_config == {"filter_project_id": ["p1", "p2"]}