Add ServerNetworkConfig CRD and network topology check at Discovery

[xkonni]

Implement the ServerNetworkConfig CRD and network topology gate at the Discovery → Available transition.

Scope

• Cluster-scoped ServerNetworkConfig (snc) CRD, auto-created by metal-operator at Discovery start
• spec.interfaces: expected topology per MAC — written by external apps (argora/NetBox)
• status.interfaces: discovered state after each probe run — IPs, carrierStatus, speed, LLDP neighbors
• NetworkCheck condition on Server.Status.Conditions; gate is opt-in via spec.interfaces

spec.interfaces	gate	condition.reason	server proceeds?
empty	off	NoConstraint	Yes
populated, discovery not yet run	on, waiting	Pending	No
populated, all matched	on	Passed	Yes
populated, mismatch found	on	Failed	No

Done

Implemented in PR #777.

[coderabbitai]

⚠️ Possible Duplicate Issue(s)

• Feature: Add current and target network state to CRD #817

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