feat: add user ID and adapter tags to AI Gateway requests

[bensabic]

• Extends the AI context (AsyncLocalStorage) in observe.ts to carry userId and tags alongside the existing model wrapper
• Adds buildProviderOptions(model, metadata) and buildGatewayProviderOptions(metadata) to merge model fallbacks with gateway user/tags fields
• Updates all agent prepareCall methods (base, source, admin) to send gateway metadata on every request
• Updates standalone generateText calls (router, web search tools, title generation, OCR) to include gateway metadata
• Web chat routes set userId to the authenticated user's ID with the web-chat tag
• Bot adapter routes derive the tag from context.platform (e.g. github-adapter, discord-adapter) and send the message author's username as the user
• Supports Vercel AI Gateway's new reporting API for per-user and per-adapter usage tracking

[vercel]

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Project	Deployment	Actions	Updated (UTC)
knowledge-agent-template	Ready	Preview, Comment	Mar 24, 2026 11:40pm

[github-actions]

Thank you for following the naming conventions! 🙏

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commit: ed213eb