Migrate all Proxmox Development Nodes to n3t.uk

[jonathanio]

Migrate all the Proxmox Development Nodes to the n3t.uk domain, matching the recent changes for all Services components, as the Proxmox Nodes are providing the service for Kubernetes in the n3t.uk Lab Environment.

Checklist

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[Copilot]

Pull request overview

This PR migrates all Proxmox development nodes from the kub3.uk domain to the n3t.uk domain, aligning them with the recent migration of service components to the n3t.uk lab environment.

• Updates inventory references from proxmox-[01:03].development.kub3.uk to proxmox-[01:03].development.n3t.uk
• Adds three new host variable files with appropriate network configurations for the migrated nodes
• Removes old kub3.uk host_vars files

Reviewed changes

Copilot reviewed 1 out of 4 changed files in this pull request and generated no comments.

File	Description
inventory.yaml	Updates host patterns in both development and proxmox groups to reference the new n3t.uk domain
plays/host_vars/proxmox-01.development.n3t.uk.yaml	Adds host configuration for proxmox-01 with IPv4/IPv6 addresses, networking settings, and Tailscale configuration
plays/host_vars/proxmox-02.development.n3t.uk.yaml	Adds host configuration for proxmox-02 with IPv4/IPv6 addresses, networking settings, and Tailscale configuration
plays/host_vars/proxmox-03.development.n3t.uk.yaml	Adds host configuration for proxmox-03 with IPv4/IPv6 addresses, networking settings, and Tailscale configuration

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