♻️ Refactor synchronization service

internal/syncer/types.go

@@ -0,0 +1,20 @@
+package syncer
+
+// Logger 描述同步模块需要的最小日志接口。
+type Logger interface {
+	Debug(message string, args ...interface{})
+	Info(message string, args ...interface{})
+	Warning(message string, args ...interface{})
+	Error(message string, args ...interface{})
+}
+
+// SyncResult 描述一次同步的结果。
+type SyncResult struct {
+	TargetID       string
+	LocalChanged   bool
+	RemoteChanged  bool
+	AppliedToLocal bool
+	Published      bool
+	ConflictCount  int
+	Revision       string
+}