fix(serverless): set secrets and scale knobs on deploy create

[Ryank90]

Summary

• deploy can attach organisation secrets at create with --secret NAME or --secret NAME=ENV_VAR, so the first rollout carries them.
• Create also accepts the scale knobs apps scale already has: --concurrency, --fallback-gpu-type, --min-available-workers, and --available-workers-pct. Passing any of them on an update is rejected.
• Help and the update error now say volumes are immutable after create.

Test plan

• A create deploy with --secret ORG_TOKEN and --min-available-workers 1 sends those fields
• The same flags on an existing app fail before upload, pointing at secrets attach or apps scale
• --volume on an update says volumes are immutable after create

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[wilsonsilva]

Thanks, all good.