feat: complete SOP version management

internal/sop/validator_test.go

@@ -36,6 +36,9 @@ func TestValidateForPublishBusinessRules(t *testing.T) {
 		{name: "duplicate default path", mutate: func(_ *[]model.SOPNode, edges *[]model.SOPEdge, _ *ValidationContext) {
 			(*edges)[1].Condition = jsonData(`{}`)
 		}, want: "配置了多条默认路径"},
+		{name: "conditional branch without default", mutate: func(_ *[]model.SOPNode, edges *[]model.SOPEdge, _ *ValidationContext) {
+			(*edges)[2].Condition = jsonData(`{"field":"emergency","operator":"not_equals","value":true}`)
+		}, want: "包含条件路径但没有默认路径"},
 		{name: "high risk without escalation", mutate: func(_ *[]model.SOPNode, edges *[]model.SOPEdge, _ *ValidationContext) {
 			(*edges)[1].TargetNodeKey = "finish"
 		}, want: "没有明确的转人工或转诊路径"},