feat(mapping): 实现健康档案映射基线（T-202）

mapping/checkid.go

@@ -0,0 +1,16 @@
+package mapping
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"strings"
+)
+
+func GenerateCheckID(sourceSystem, dataType, sourceRecordID, version string) string {
+	parts := []string{sourceSystem, dataType, sourceRecordID}
+	if version != "" {
+		parts = append(parts, version)
+	}
+	sum := sha1.Sum([]byte(strings.Join(parts, "|")))
+	return hex.EncodeToString(sum[:])[:20]
+}