[Federico Laurianti (Laurianti)]

What does this PR do?

azurebackup vault create --vault-type rsv now applies --storage-type. After the vault is created, the redundancy is set through the backup storage config, the same way azurebackup vault update --redundancy does for RSV vaults. Without --storage-type the requests are unchanged.

Added CreateVaultAsync_RsvWithStorageType_ConfiguresStorageRedundancy to VaultCreateExistenceTests. It fails without the fix: only the vault GET and PUT are sent.

GitHub issue number?

Fixes #3981

Pre-merge Checklist

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[github-actions]

Thank you for your contribution Federico Laurianti (@Laurianti)! We will review the pull request and get back to you soon.

[Copilot]

🟢 Approval recommended

The focused fix reuses existing behavior, preserves requests when the option is omitted, and includes targeted regression coverage.

No open issues 🎉

What changed in this PR

Fixes #3981 by applying --storage-type when creating Recovery Services vaults through Azure Backup.

Changes:

• Reuses existing storage redundancy configuration after vault creation.
• Adds regression coverage for the configuration requests and payload.
• Records the fix in the changelog.

File	Description
tools/​Azure.Mcp.Tools.AzureBackup/​tests/​Azure.Mcp.Tools.AzureBackup.Tests/​Services/​VaultCreateExistenceTests.cs	Verifies requested redundancy is sent.
tools/​Azure.Mcp.Tools.AzureBackup/​src/​Services/​RsvBackupOperations.cs	Applies storage redundancy when specified.
servers/​Azure.Mcp.Server/​changelog-entries/​1792353214661.yaml	Documents the bug fix.

_{Review effort: Balanced}