修复凭证测试器计数器、消除panic、补齐i18n

- credential_tester: testCredentialWithRetry返回ErrorType，修复网络错误计数器永久不递增的bug
- scanner: os.Exit(1)改为return，defer Cleanup可正常执行
- probe_parser: 5处panic改为error返回，调用链透传到init()
- common库: parsers/initialize/network/session共17处硬编码中文改用i18n
- services插件: 18个文件115处硬编码中文改用i18n
- locale: 补齐service/parser/network相关~25个中英文键

plugins/services/mongodb.go

@@ -63,7 +63,7 @@ func (p *MongoDBPlugin) Scan(ctx context.Context, info *common.HostInfo, session
 		return &ScanResult{
 			Success: false,
 			Service: "mongodb",
-			Error:   fmt.Errorf("没有可用的测试凭据"),
+			Error:   fmt.Errorf(i18n.GetText("service_no_credentials")),
 		}
 	}
 
@@ -237,14 +237,14 @@ func (p *MongoDBPlugin) mongodbUnauth(ctx context.Context, info *common.HostInfo
 		return false, nil
 	}
 
-	return false, fmt.Errorf("无法识别为MongoDB服务")
+	return false, fmt.Errorf(i18n.Tr("service_not_identified", "MongoDB"))
 }
 
 // checkMongoAuth 检查MongoDB认证状态
 func (p *MongoDBPlugin) checkMongoAuth(ctx context.Context, address string, packet []byte, session *common.ScanSession) (string, error) {
 	conn, err := session.DialTCP(ctx, "tcp", address, session.Config.Timeout)
 	if err != nil {
-		return "", fmt.Errorf("连接失败: %w", err)
+		return "", fmt.Errorf(i18n.Tr("service_connection_failed", "%w"), err)
 	}
 	defer func() { _ = conn.Close() }()