first commit

sync_state_machine/domain/attachment/sync_node.py

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+"""
+Attachment Domain
+"""
+from typing import Dict, Any
+from pydantic import BaseModel, ConfigDict
+from ...common import SyncNode
+
+
+class AttachmentSchema(BaseModel):
+    """允许任意附件字段的 schema"""
+    model_config = ConfigDict(extra="allow")
+
+
+class AttachmentSyncNode(SyncNode[Dict[str, Any]]):
+    """附件同步节点"""
+    node_type = "attachment"
+    schema = AttachmentSchema