feat: runtime compatibility badges per package

[2u841r]

Describe the feature

Show runtime compatibility badges on package pages so developers know — before adding a package — whether it works on non-Node runtimes.

Uses runtime-compat-data (unjs) as the data source.

Runtimes: node · workerd · deno · bun · edge-light · netlify · llrt · fastly

Approach:

1. Scan package entry points for Node built-in imports + global API usage
2. Cross-ref against runtime-compat-data
3. Also check exports for runtime-specific conditions (workerd, worker, etc.)

References:

• https://github.com/unjs/runtime-compat
• https://runtime-compat.unjs.io

Additional information

• Would you be willing to help implement this feature?