Bump client_version to 0.144.6 (above the 0.144.0 gate in codex CLI's
manifest) so /codex/models no longer returns 200 with newest entries
silently filtered out. Add the originator: codex_cli_rs header used by
every other codex call site, and move the entry onto buildOAuthResolver
so token refresh on 401/403 and a warning field on empty results are
wired in, matching gemini-cli and grok-cli.
