Remove CLI binary from sdk-functions package

[shrey150]

Summary

• Removed the bin field from package.json so this package no longer registers a bb binary
• Removed CLI-only dependencies: commander, chalk, dotenv, archiver, tsx, @types/archiver
• Removed the CLI build config from tsup.config.ts (the second entry that built src/cli/main.ts and copied templates)
• Kept all runtime library dependencies (@browserbasehq/sdk, zod) — verified these are the only ones imported by non-CLI source files

The CLI functionality (bb init, bb dev, bb publish) has been moved to @browserbasehq/cli which uses subcommands (bb functions init, etc). Having both packages register a bb binary causes conflicts on install.

The src/cli/ directory is intentionally left in place — source cleanup will follow in a separate PR.

Test plan

• pnpm install succeeds with reduced dependency set
• pnpm run build succeeds — produces dist/index.js, dist/index.cjs, and type declarations
• Verify npm pack / pnpm pack output no longer includes cli.js
• Confirm installing this package no longer creates a bb binary in node_modules/.bin

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