docs(ai-transport): add roadmap page

[rainbowFi]

What

Adds a customer-facing AI Transport roadmap page (AIT-1029) to give readers an indication of where the product is going next and inviting feedback.

• New page src/pages/docs/ai-transport/roadmap.mdx covering three horizons — Now, Next, Future — as capability tables.
• "Now" capabilities link to their existing feature/concept pages (all 15 links verified to resolve).
• Opens with a short framing line inviting readers to contact Ably to influence the roadmap.
• Adds a Roadmap entry to the AI Transport navigation (src/data/nav/aitransport.ts), after the API reference and before the Internals.

[coderabbitai]

Important

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch AIT-1029

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