feat: 修复 AI 风险语义并隔离 Mock 数据

server-go/internal/service/cross_validate.go

@@ -1,5 +1,7 @@
 package service
 
+import "strings"
+
 // CrossValidate 交叉验证：AI 检测结果 vs LAMP 检测结果（规格书：一致→确认诊断；不一致→升级专家会诊）
 func CrossValidate(aiClass, lampResult string, lampDiseases []string) (bool, string) {
 	switch {
@@ -7,6 +9,8 @@ func CrossValidate(aiClass, lampResult string, lampDiseases []string) (bool, str
 		return false, "LAMP 判读无效，建议复检或专家会诊"
 	case aiClass == "":
 		return false, "未找到关联巡检记录，暂无法交叉验证"
+	case aiClass == "unknown":
+		return false, "AI 结果未知，建议复检或专家会诊"
 	case aiClass == "sick" && lampResult == "positive":
 		return true, "AI 检出异常与 LAMP 阳性一致，确认诊断"
 	case aiClass == "healthy" && lampResult == "negative":
@@ -20,15 +24,26 @@ func CrossValidate(aiClass, lampResult string, lampDiseases []string) (bool, str
 	}
 }
 
-// AIClassFromDetections 从巡检检测结果归纳 AI 结论（任一非 healthy 视为 sick）
+// AIClassFromDetections 从巡检检测结果归纳 AI 结论；空检测或 unknown 不当作 healthy。
 func AIClassFromDetections(detections []AIDetection) string {
 	if len(detections) == 0 {
-		return ""
+		return "unknown"
 	}
+	healthySeen := false
+	unknownSeen := false
 	for _, d := range detections {
-		if d.ClassName != "healthy" {
+		class := strings.ToLower(strings.TrimSpace(d.ClassName))
+		switch class {
+		case "healthy":
+			healthySeen = true
+		case "", "unknown":
+			unknownSeen = true
+		default:
 			return "sick"
 		}
 	}
-	return "healthy"
+	if healthySeen && !unknownSeen {
+		return "healthy"
+	}
+	return "unknown"
 }