feat: add eval_config support to RL API client

[JannikSt]

Adds missing eval_config support to the RL API client.

Changes:

• Add eval_config field to RLRun model
• Add eval_config parameter to create_run()
• Wire up payload["eval"] in request body

Relates to #256

---

Note

Introduces evaluation support and log streaming to hosted RL.

• API: Add eval_config to RLRun; create_run() accepts eval_config and sends it as payload["eval"]; new get_logs(run_id, tail_lines) to fetch run logs.
• CLI: New prime rl logs command with --follow/--tail, cleans output by stripping ANSI and filtering progress bars.
• CLI run flow: Add eval options (--eval-envs, --eval-interval, --eval-num-examples, --eval-rollouts, --eval-base-model), merge with TOML [eval], warn if options used without eval envs, and show eval settings in summary; validate environment slug format.
• Minor formatting/UX tweaks to messages and help text.

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[JannikSt]

@codex review

[chatgpt-codex-connector]

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