feat(cli): add --dry-run guardrails to mutating scale commands

[emil07770]

Summary

Closes #144. Addresses #133.

Adds --dry-run to every scale subcommand that mutates live infrastructure, implementing the global CLI convention ("supported by anything that spends money, ships bits, or sends mail"):

Command	Without --dry-run	With --dry-run
scale up	provisions new instances (billing starts)	prints plan, exits 0
scale down	destroys instances	prints plan, exits 0
scale auto	saves autoscale rule to cloud	prints rule JSON, exits 0
scale dns	writes live DNS records	prints DNS plan, exits 0
scale rollout	shifts production traffic	prints rollout plan, exits 0
scale deploy destroy	tears down instance (billing stops)	prints what would be destroyed, exits 0

Also fixes a latent bug: scale rollout declared --version <id> which conflicts with Commander.js's built-in -V / --version flag, causing sh1pt scale rollout --version v1.4.2 to print the CLI version string instead of executing the subcommand. The option is renamed to --release <id>.

Implementation details

• A shared dryRunGuard(label, opts) helper in scale.ts keeps all six short-circuits DRY — checks opts.dryRun, formats a [dry-run] <label> · key=value … summary line, and returns true so the caller can return immediately.
• deploy destroy gets the same --dry-run guard in deploy.ts since it's the most destructive action in the tree.
• 7 focused Vitest tests: one per guarded command, plus a regression that confirms rollout registers --release and not --version.

Test plan

• pnpm exec vitest run packages/cli/src/commands/scale-dry-run.test.ts — 7/7 pass
• pnpm --filter @profullstack/sh1pt typecheck — no errors
• git diff --check — no trailing whitespace

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