feat: migrate golangci-lint from v1 to v2 (#144)

Migrate golangci-lint from v1 to v2.

## Motivation and Context
The golangci-lint has been upgraded to v2 since March 2025.
The v2 of golangci-lint has simplified the linters management.

## How Has This Been Tested?
Tested locally with golangci-lint@v2.1.6

## Breaking Changes
No.

## Types of changes
- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [x] New and existing tests pass locally
- [x] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

## Additional context
<!-- Add any other context, implementation notes, or design decisions
-->

---------

Co-authored-by: haokunt <haokunt@opera.com>
Co-authored-by: Avinash Sridhar <sridharavinash@users.noreply.github.com>
Co-authored-by: Adam Jones <adamj+git@anthropic.com>

internal/database/memory.go

@@ -48,10 +48,7 @@ func compareSemanticVersions(version1, version2 string) int {
 	parts2 := strings.Split(version2, ".")
 
 	// Pad with zeros if needed
-	maxLen := len(parts1)
-	if len(parts2) > maxLen {
-		maxLen = len(parts2)
-	}
+	maxLen := max(len(parts2), len(parts1))
 
 	for len(parts1) < maxLen {
 		parts1 = append(parts1, "0")
@@ -162,10 +159,7 @@ func (db *MemoryDB) List(
 	})
 
 	// Apply pagination
-	endIdx := startIdx + limit
-	if endIdx > len(filteredEntries) {
-		endIdx = len(filteredEntries)
-	}
+	endIdx := min(startIdx+limit, len(filteredEntries))
 
 	var result []*model.Server
 	if startIdx < len(filteredEntries) {