fix(p2p): validate received node info to prevent nil NetAddress crash

[omarsy]

Fix handshake validation to check the received peer NodeInfo (not local NodeInfo), closing a path where malformed peer payloads could bypass validation and trigger nil dereference later in handshake flow.

Also harden NodeInfo.Validate by rejecting nil NetAddress explicitly.

Tests:

• add NodeInfo.Validate regression for missing NetAddress

• add transport handshake regression for malformed peer node info

Context: NEWTENDG-161

[Gno2D2]

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[ltzmaxwell]

LGTM.