Fix SSH with explicit project names

[anishfyi]

Summary

Fixes #1104.

Allow railway ssh --project <name-or-id> --environment <environment> --service <service> to work outside a linked project directory. Explicit project values now use the existing project ID-or-name resolver before fetching project details.

A regression test covers resolving a project name with no local link and verifies that the resolved project ID is used for the project query.

Validation

• cargo fmt --all -- --check
• cargo clippy --all-targets --all-features
• cargo test (1,274 tests)

[anishfyi]

The label check requires a maintainer-applied release label. Could you please add release/patch if that is the appropriate classification for this fix?

[anishfyi]

I also covered the explicit --project plus --environment case when --service is omitted. It no longer requires a local link and directly selects the project's sole service. The expanded regression test, full cargo test, formatting, and git diff --check pass. Normal Clippy completes with the repository's existing unrelated warnings.