chore: remove serverless from peer dependencies

[renesansz]

osls is now the primary deployment tool with optional peer dependency. The bin script's fallback logic (osls → serverless) preserves backward compatibility if serverless is installed globally or locally.

Why this is sufficient

• Removing the peer dep entry stops npm from warning/requiring serverless during install
• The bin script's fallback logic already makes serverless work transparently if it happens to be installed globally or locally by the consumer
• No TypeScript types, no imports, no runtime code references serverless directly

Verification

1. npm install in a fresh consumer project should produce no peer dependency warnings about serverless
2. If serverless is installed, lesgo-scripts.sh still resolves and uses it correctly (fallback path still present in the script)
3. If only osls is installed, the script uses osls as before

[Copilot]

Pull request overview

Removes serverless from peerDependencies to avoid peer-dep install warnings, while keeping osls as the (optional) peer dependency for deployment tooling.

Changes:

• Removed serverless from peerDependencies.
• Removed the corresponding peerDependenciesMeta.serverless optional flag.

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[daison12006013]

🚀 Looks good to me, the locked file was updated too!