[management] unify domain validation into single package used

[pascal-fischer]

Describe your changes

Issue ticket number and link

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Checklist

• Is it a bug fix
• Is a typo/documentation fix
• Is a feature enhancement
• It is a refactor
• Created tests that fail without the change (if possible)
• Extended the README / documentation, if necessary

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[Copilot]

Pull Request Overview

This PR consolidates domain validation logic across the codebase by introducing unified validation functions in the shared domain package and replacing scattered validation implementations throughout the management server.

• Introduces IsValidDomain and ToValidDomain functions in the shared domain package
• Removes duplicate domain validation regex patterns from multiple files
• Updates all domain validation calls to use the centralized validation functions

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
shared/management/domain/validate.go	Adds new unified domain validation functions and refactors existing validation logic
management/server/networks/resources/types/resource.go	Replaces local domain regex with shared validation function
management/server/nameserver.go	Removes local domain validation implementation in favor of shared function
management/server/account.go	Replaces local domain validation regex with shared validation function

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud