fix: ensure build typedoc plugin is ran on the server only

[Tay0108]

Problem

Two issues prevented yarn workspace website start from working:

1. Plugin Build Missing: doc-docusaurus-rfg-plugin was not compiled from TypeScript to JavaScript, so Docusaurus couldn't locate its entry point (lib/index.js)

2. Server-Only Modules Bundled for Browser: The doc-docusaurus-typedoc-plugin depends on typedoc, which uses Node.js-only modules (child_process, inspector, module). These were being included in the client-side webpack bundle, causing resolution failures since browsers don't have access to Node APIs.

Solution

1. Build the Plugin

Run yarn workspace doc-docusaurus-rfg-plugin build to generate the compiled JavaScript entry point.

2. Exclude typedoc from Client Bundle

Added a custom Docusaurus plugin that configures webpack to exclude typedoc:

• Prevents Node-only modules from being bundled for the browser
• Avoids webpack resolution errors for child_process, module, inspector, etc.

3. Server-Only Plugin Inclusion

Conditionally include doc-docusaurus-typedoc-plugin only during server-side build:

• Uses typeof window === 'undefined' to detect server vs. browser environment
• Ensures plugin code never runs in the browser

4. Improved Type Safety

Refactored conditional plugin inclusion using spread operators to avoid TypeScript type errors with null values.