docs(ai): add AI Chat with useChat guide
Comprehensive guide covering: - Quick start with chatTask + TriggerChatTransport - Backend patterns: simple (return streamText), complex (pipeChat), and manual (task + ChatTaskPayload) - Frontend options: dynamic tokens, extra data, self-hosting - ChatTaskPayload reference - Added to Writing tasks navigation near Streams Co-authored-by: Eric Allam <eric@trigger.dev>
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