Document SignalWire surfaces in Platform docs

[niravcodes]

Description

• New Pick a product page in the Platform nav: what SWML (via the Server SDKs Agents namespace), the REST APIs, the Browser SDK, and Relay each do, when to use each, and how they combine with phone numbers, Resources, SWAIG tools, and Datasphere. Uses the Bayview Taxi example throughout.

Preview

• https://signalwire-preview-docs-747.docs.buildwithfern.com/docs/platform/pick-a-product
• https://signalwire-preview-docs-747.docs.buildwithfern.com/docs/browser-sdk/v4/guides/call-controls#receive-user-events-from-the-call

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Code cleanup / refactor

Related Issues

#746

Testing

• Added/updated unit tests
• Tested manually
• Tested with live SignalWire credentials (if applicable)

Checklist

• I have read the CONTRIBUTING guidelines
• My code follows the project's style guidelines
• I have added tests for my changes (if applicable)
• I have updated documentation (if applicable)
• All existing tests pass

Additional Notes

[github-actions]

🌿 Preview

https://signalwire-preview-docs-747.docs.buildwithfern.com/docs

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