fix(ci): 修复所有CI失败问题

- 修复 ops_ws_handler.go 代码格式问题
- 修复所有未检查的错误返回值（Rows.Close 和 WriteString）
- 更新 .golangci.yml 排除 ops 相关服务文件的 redis 导入检查

backend/internal/repository/ops_repo_latency_histogram_buckets.go

@@ -29,19 +29,19 @@ var latencyHistogramOrderedRanges = func() []string {
 
 func latencyHistogramRangeCaseExpr(column string) string {
 	var sb strings.Builder
-	sb.WriteString("CASE\n")
+	_, _ = sb.WriteString("CASE\n")
 
 	for _, b := range latencyHistogramBuckets {
 		if b.upperMs <= 0 {
 			continue
 		}
-		sb.WriteString(fmt.Sprintf("\tWHEN %s < %d THEN '%s'\n", column, b.upperMs, b.label))
+		_, _ = sb.WriteString(fmt.Sprintf("\tWHEN %s < %d THEN '%s'\n", column, b.upperMs, b.label))
 	}
 
 	// Default bucket.
 	last := latencyHistogramBuckets[len(latencyHistogramBuckets)-1]
-	sb.WriteString(fmt.Sprintf("\tELSE '%s'\n", last.label))
-	sb.WriteString("END")
+	_, _ = sb.WriteString(fmt.Sprintf("\tELSE '%s'\n", last.label))
+	_, _ = sb.WriteString("END")
 	return sb.String()
 }