Display expires_at on API keys

[devin-ai-integration]

Summary

The manage API now returns expires_at on both the key listing and the single-key response (see requestyai/backend@c51fb29). This surfaces it in the CLI:

• internal/client: APIKey and APIKeyDetails decode expires_at into ExpiresAt *time.Time (omitted/nil = non-expiring key).
• api-keys list: new EXPIRES column between LIMIT and LABELS.
• api-keys show: new Expires field after Monthly limit.
• --json output includes expires_at automatically via the updated structs.

A nil expiry renders as never via a new formatExpiry helper, matching the token api-keys set expiry <id> never already accepts, e.g.:

ID     NAME        SPEND   LIMIT      EXPIRES               LABELS
key-1  production  $12.50  $500.00    2026-12-31T23:59:59Z  env=prod
key-2  scratch     $0.00   unlimited  never                 -

Verified end-to-end against a stub of the manage API (list, show, and --json), plus gofmt -l ., go build, and go test ./....

Link to Devin session: https://app.devin.ai/sessions/8369a92fda714f408b04215c0511b5f6
Open in Devin Desktop: https://app.devin.ai/desktop/session/8369a92fda714f408b04215c0511b5f6?variant=devin

[devin-ai-integration]

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_{Updated 2026-09-09T13:28Z · last 30 days · data from Requesty}