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/mssql.go

@@ -39,7 +39,7 @@ func (p *MSSQLPlugin) Scan(ctx context.Context, info *common.HostInfo, session *
 		return &ScanResult{
 			Success: false,
 			Service: "mssql",
-			Error:   fmt.Errorf("没有可用的测试凭据"),
+			Error:   fmt.Errorf(i18n.GetText("service_no_credentials")),
 		}
 	}
 
@@ -188,7 +188,7 @@ func (p *MSSQLPlugin) identifyService(ctx context.Context, info *common.HostInfo
 		return &ScanResult{
 			Success: false,
 			Service: "mssql",
-			Error:   fmt.Errorf("无法识别为MSSQL服务"),
+			Error:   fmt.Errorf(i18n.Tr("service_not_identified", "MSSQL")),
 		}
 	}