feat: 修复 AI 风险语义并隔离 Mock 数据

server-go/internal/service/ai_client.go

@@ -29,8 +29,36 @@ type AIDetection struct {
 
 // AIDetectResponse /detect 响应
 type AIDetectResponse struct {
-	Model      string        `json:"model"`
-	Detections []AIDetection `json:"detections"`
+	Model               string        `json:"model"`
+	ModelVersion        string        `json:"modelVersion"`
+	IsMock              bool          `json:"isMock"`
+	Status              string        `json:"status"`
+	AbnormalProbability float64       `json:"abnormalProbability"`
+	Detections          []AIDetection `json:"detections"`
+}
+
+// AIDetectionStatus 从检测结果归纳 AI 状态；空检测或 unknown 不当作 healthy。
+func AIDetectionStatus(detections []AIDetection) string {
+	if len(detections) == 0 {
+		return "unknown"
+	}
+	healthySeen := false
+	unknownSeen := false
+	for _, d := range detections {
+		class := strings.ToLower(strings.TrimSpace(d.ClassName))
+		switch class {
+		case "healthy":
+			healthySeen = true
+		case "", "unknown":
+			unknownSeen = true
+		default:
+			return "abnormal"
+		}
+	}
+	if healthySeen && !unknownSeen {
+		return "healthy"
+	}
+	return "unknown"
 }
 
 // AIClient ai-service HTTP 客户端