Per-key limits, capability badges, and a proper onboarding

Onboarding

A new onboarding flow walks first-time users through their first request without leaving the dashboard.

Per-key lifetime limits

Cap any API key's total requests or tokens — set it from the Keys page, choose hard cutoff or warn-mode.

Capability badges

Model cards now show at a glance which models support tool calling, JSON mode, and vision — no more guessing whether to bring out the parser.

More providers and models added across the catalog.

Fixes & QOL

Usage reset timer now reflects the real window even when it's already expired. Dashboard logs only show the requests you actually made — no internal noise.