* feat(nord): support multi-server NordLynx outbounds
* fix(nord): address verified PR review findings
Tighten the NordVPN multi-outbound implementation and its regression
coverage based on the verified review feedback.
- remove the redundant Xray validation test that duplicated the base
branch and did not exercise multiple outbounds
- make NordModal tests wait for server loading and assert the modal close
callback, duplicate-server state, and endpoint behavior
- add coverage for resolving the NordLynx public key from technology
metadata instead of a numeric technology ID
- use a real httptest server for Nord integration tests through an
injectable API base URL
- represent the All Cities sentinel consistently as null and reset it
when a country changes
The existing NordVPN API contracts and persisted outbound schema remain
unchanged.
Masterain