Enforce dynamic offer unit types

[protocolwhisper]

Motivation

TempVPN provides temporary WireGuard VPN access through a registry-owned Tempo MPP control plane. Agents can discover eligible exit nodes, buy portable fixed-duration access, or open a separate metered Session v2 stream. This update makes the directory’s dynamic fixed-session metadata unambiguous: the API receives seconds while billing is per minute.

• Service name: TempVPN
• Live service URL: https://registry.tempvpn.xyz
• Provider URL: https://tempvpn.xyz
• OpenAPI or API reference URL: https://registry.tempvpn.xyz/openapi.json

Summary

• The service is live and accepts MPP payments.
• This PR updates its entry in schemas/services.ts.
• Listed endpoints, prices, and payment methods match the live service.
• Public documentation and icon URLs are stable and accessible.
• pnpm generate:discovery succeeds.
• pnpm check:types passes.
• pnpm build succeeds.

This PR preserves endpoint-configured unitType values for dynamic payment offers and updates TempVPN’s hint to: $0.01 per billed minute; send duration_seconds as a positive multiple of 60.

Key design considerations

• Integration: third-party
• Payment methods and intents: Tempo MPP; charge for dynamic fixed-session purchases and session for Session v2 metered streaming.
• Provider relationship: I operate TempVPN.
• Directory fit: TempVPN is a live production service with a public registry, MPP payment challenges, OpenAPI contract, and stable documentation. Its node discovery, portable prepaid balances, and WireGuard delivery are distinct from existing directory entries.

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