first commit

sync_state_machine/domain/attachment/sync_strategy.py

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+from ...sync_system.strategy import DefaultSyncStrategy
+from ...sync_system.config import StrategyConfig, OrphanAction, UpdateDirection
+from .sync_node import AttachmentSchema
+
+
+class AttachmentSyncStrategy(DefaultSyncStrategy[AttachmentSchema]):
+    """
+    Attachment 同步策略（仅作为依赖，不执行同步动作）。
+    """
+
+    schema = AttachmentSchema
+
+    default_config = StrategyConfig(
+        auto_bind=False,
+        auto_bind_fields=[],
+        depend_fields={},
+        local_orphan_action=OrphanAction.NONE,
+        remote_orphan_action=OrphanAction.NONE,
+        update_direction=UpdateDirection.PUSH,
+    )