Switch SignalK install to npm

[mgrouch]

Motivation

• Replace pnpm with regular npm for plugin installation to simplify the install flow and avoid pnpm-specific approval/workarounds.
• Remove pnpm-related environment setup and runtime patches that are no longer necessary when using npm.

Description

• Removed pnpm from the global tooling install and kept npm, patch-package, typescript, and node-gyp in the npm install -g step in install-scripts/4-server/04-signalk.sh.
• Removed PNPM_HOME and PATH modifications and updated the log output to no longer reference pnpm.
• Switched plugin installation from pnpm install ... (with pnpm approve-builds) to npm install --unsafe-perm --loglevel error --omit=dev ... and removed the pnpm-specific sed patches that switched signalk-server to use pnpm.

Testing

• No automated tests were run for this change.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/switch-from-pnpm-to-npm-in-install-script

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