feat(pkg/util): 补齐版本比较、网络与格式化通用助手

下游 OpenFlare 的边缘守护进程与发布流程需要这些与业务无关的纯函数，
按上游/下游归属规约回流到平台层，避免下游在上游目录里长期携带本地文件：

- version / version_compare：CompareVersions、ParseVersionInfo（版本区间比较）
- network：GetIP、IsPrivateIPv4
- format / value / string / slice：Bytes2Size、Seconds2Time、Interface2String、
  TrimStringFields、UniqueAndCleanStringSlice 与 IdentifiableTimeRecord

验证：go build 通过；go test ./... exit 0（48 包 ok）；
check_cordis_architecture.sh 0 violations；golangci-lint 0 issues；gofmt 干净。

backend/pkg/util/version_compare.go

@@ -0,0 +1,108 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package util
+
+import "strconv"
+
+func compareVersionNumbers(left, right VersionInfo) int {
+	maxLen := max(len(right.Numbers), len(left.Numbers))
+	for index := range maxLen {
+		leftValue := 0
+		rightValue := 0
+		if index < len(left.Numbers) {
+			leftValue = left.Numbers[index]
+		}
+		if index < len(right.Numbers) {
+			rightValue = right.Numbers[index]
+		}
+		if leftValue < rightValue {
+			return -1
+		}
+		if leftValue > rightValue {
+			return 1
+		}
+	}
+	return 0
+}
+
+func compareGitDescribeDistance(left, right VersionInfo) int {
+	if left.GitDescribeDistance == right.GitDescribeDistance {
+		return 0
+	}
+	if left.GitDescribeDistance < right.GitDescribeDistance {
+		return -1
+	}
+	return 1
+}
+
+func compareGitDescribeTails(left, right VersionInfo) int {
+	maxLen := max(len(right.GitDescribeTail), len(left.GitDescribeTail))
+	for index := range maxLen {
+		if index >= len(left.GitDescribeTail) {
+			return -1
+		}
+		if index >= len(right.GitDescribeTail) {
+			return 1
+		}
+		if left.GitDescribeTail[index] < right.GitDescribeTail[index] {
+			return -1
+		}
+		if left.GitDescribeTail[index] > right.GitDescribeTail[index] {
+			return 1
+		}
+	}
+	return 0
+}
+
+func comparePrereleaseIdentifiers(left, right VersionInfo) int {
+	if len(left.Prerelease) == 0 && len(right.Prerelease) == 0 {
+		return 0
+	}
+	if len(left.Prerelease) == 0 {
+		return 1
+	}
+	if len(right.Prerelease) == 0 {
+		return -1
+	}
+
+	maxLen := max(len(right.Prerelease), len(left.Prerelease))
+	for index := range maxLen {
+		if index >= len(left.Prerelease) {
+			return -1
+		}
+		if index >= len(right.Prerelease) {
+			return 1
+		}
+		if result := comparePrereleasePart(left.Prerelease[index], right.Prerelease[index]); result != 0 {
+			return result
+		}
+	}
+	return 0
+}
+
+func comparePrereleasePart(leftPart, rightPart string) int {
+	leftNumber, leftErr := strconv.Atoi(leftPart)
+	rightNumber, rightErr := strconv.Atoi(rightPart)
+	switch {
+	case leftErr == nil && rightErr == nil:
+		if leftNumber < rightNumber {
+			return -1
+		}
+		if leftNumber > rightNumber {
+			return 1
+		}
+	case leftErr == nil:
+		return -1
+	case rightErr == nil:
+		return 1
+	default:
+		if leftPart < rightPart {
+			return -1
+		}
+		if leftPart > rightPart {
+			return 1
+		}
+	}
+	return 0
+}