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/memcached.go

@@ -59,7 +59,7 @@ func (p *MemcachedPlugin) testUnauthorizedAccess(ctx context.Context, info *comm
 			Type:    plugins.ResultTypeVuln,
 			Success: true,
 			Service: "memcached",
-			Banner:  "未授权访问",
+			Banner:  i18n.GetText("service_unauthorized"),
 		}
 	}
 
@@ -140,7 +140,7 @@ func (p *MemcachedPlugin) identifyService(ctx context.Context, info *common.Host
 	return &ScanResult{
 		Success: false,
 		Service: "memcached",
-		Error:   fmt.Errorf("无法识别为Memcached服务"),
+		Error:   fmt.Errorf(i18n.Tr("service_not_identified", "Memcached")),
 	}
 }