feat(find): add --show-price flag (#50)

[scttfrdmn]

Closes #50.

truffle find had no --show-price — only the deprecated search (which #44 merged into find) and the spot-centric spot command exposed on-demand pricing. So the canonical "what does this instance cost" question couldn't be answered with the canonical search command; you had to fall back to spot or the raw AWS Pricing API.

Change

• Add --show-price to find, populating the on-demand $/hr column via awsClient.OnDemandPrice (SageMaker ml.* types keep their AmazonSageMaker management-premium rate). Composes with --regions so price shows per region.
• Default output is unchanged — no price column unless --show-price is passed.
• Mirrors the behavior the old search --show-price had.

Verify

truffle find g5.12xlarge --show-price --regions us-east-1
# → $/hr column shows $5.6720
truffle find g5.12xlarge --regions us-east-1
# → no $/hr column (default)

Tested live (g5.12xlarge → $5.6720, exactly the issue's g5.4xlarge-vs-g5.12xlarge comparison use case). TestFindCommand_Flags asserts the flag; docs-gen/find.md regenerated so the drift gate passes.

[codecov]

Codecov Report

❌ Patch coverage is 11.11111% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
cmd/find.go	11.11%	8 Missing ⚠️

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