fix(deps): move local-functions-proxy to optionalDependencies for --omit=optional support

[HosnainRafi]

Problem

netlify-cli@26.2.0 installs the @netlify/local-functions-proxy-linux-x64@1.1.1 platform binary even when npm is invoked with --omit=optional. This happens because the dependency is in regular dependencies rather than optionalDependencies, so npm does not respect the --omit=optional flag for it.

The bundled Go binary has flagged security vulnerabilities including:

• CVE-2023-24538
• CVE-2023-24540
• CVE-2024-24790
• CVE-2025-68121

Solution

1. Moved @netlify/local-functions-proxy from dependencies to optionalDependencies in package.json. This ensures that npm install --omit=optional will skip the platform-specific binary packages.

2. Changed the import in src/lib/functions/local-proxy.ts from a static import to a dynamic import with error handling. When the package is not installed (e.g., with --omit=optional), the CLI still works but local functions proxy is unavailable — a clear error is thrown when the user tries to use local functions.

Testing

• TypeScript compiles cleanly (npm run build passes)
• ESLint clean
• Prettier/oxfmt formatted
• The CLI still works without local functions proxy when the package is not installed

Fixes #8342

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 85c0113 and 9ca15ce.

📒 Files selected for processing (2)

• package.json
• src/lib/functions/local-proxy.ts

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