Add Barrelbot/Play maps, CoreProtect IDs, and gunicorn 23

[Geph]

Summary

• Close-out for #43: bump gunicorn 21.2.0 → 23.0.0 (fixes open request-smuggling alerts; 21.2.1 was insufficient)
• From #38, take what’s still needed:
  • Add Mars Barrelbot and Play maps + config entries
  • Restore real CoreProtect IDs in config-sample.json
  • Add and wire Tilted Earth PNGs (Frozen / Jungle→Warm / Melting) with matching pixel ratios
  • Not included: UNCC2023 / UNCC2024 maps

Test plan

• Diff config-sample.json against production config.json and confirm CoreProtect IDs match expectations
• Confirm Barrelbot / Play / new Tilted Earth images render for known players
• Redeploy with pip install -r requirements.txt and verify gunicorn starts the Flask app
• Close #38 after this merges

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