Support OpenAPI server variables during onboarding

[RhysSullivan]

Summary

• Preserve enum and description on server variables through extraction + preview (previously we flattened to just the default).
• Rework the Add OpenAPI Source UI to render per-variable pickers (enum → select, free-form → input) and submit a resolved base URL instead of a templated one like https://{region}.sentry.io.
• Tighten SpecPreview.servers from Schema.Array(Schema.Unknown) to Schema.Array(ServerInfo) and export ServerVariable + substituteUrlVariables from the SDK.

Why

Specs like Sentry's declare server variables with enums:

servers:
  - url: https://{region}.sentry.io
    variables:
      region:
        default: us
        enum: [us, de]

Previously the UI stored the literal https://{region}.sentry.io as the base URL, which broke requests. Users also had no way to pick de over us.

Test plan

• bunx vitest run in packages/plugins/openapi (27 passing, incl. new extraction test for Sentry-style {region} with enum + description)
• bunx turbo run typecheck across all 28 packages
• Manual: onboard a Sentry-style spec, verify the region picker appears and the resolved base URL is stored

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