LIKE 过滤器转义修复：日志搜索含 %/_ 的输入不再被当通配符；pkg/util 新增 EscapeLike 共享助手 + 单测

Result: {"status":"keep","total_issues":8,"eslint_errors":0,"eslint_problems":0,"eslint_warnings":0,"golint_canonicalheader":0,"golint_errname":0,"golint_errorlint":1,"golint_exhaustive":0,"golint_forcetypeassert":0,"golint_gosec":0,"golint_intrange":0,"golint_modernize":3,"golint_nilnil":3,"golint_perfsprint":0,"golint_prealloc":0,"golint_recvcheck":1,"golint_test_testifylint":0,"golint_test_thelper":0,"golint_test_total":0,"golint_test_usetesting":0,"golint_total":8,"golint_usestdlibvars":0,"golint_vetx_total":0,"golint_wastedassign":0,"measure_s":106,"tsc_errors":0,"vitest_failed":0,"vitest_total":126}

pkg/util/like.go

@@ -0,0 +1,16 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package util
+
+import "strings"
+
+var likeEscaper = strings.NewReplacer(`\`, `\\`, `%`, `\%`, `_`, `\_`)
+
+// EscapeLike escapes SQL LIKE metacharacters (\, %, _) so a user-supplied
+// value matches literally in LIKE patterns. Pair it with an explicit
+// `ESCAPE '\'` clause where the dialect has no backslash default (SQLite);
+// PostgreSQL and ClickHouse treat backslash as the default LIKE escape.
+func EscapeLike(value string) string {
+	return likeEscaper.Replace(value)
+}