fix(rsvp-form): remap type to a substrate + displayAs to the widget

[qiyundai]

Summary

• Mirrors the same remap change proposed for events-form.js (PR #191) — this block's resolveRsvpConfig is an independent port of getRsvpConfigFromMeta, so it needs the identical extension to stay in sync.
• ESP's RSVP field type is being redesigned to name only the fundamental substrate (text, select, multi-select); displayAs now fully determines the concrete widget.
• fields.js's FIELD_BUILDERS and payload.js need no changes — verified their dispatch keys and boolean-collapse logic already match every internal dispatch type this remap produces.
• Adds type="url" to createTextField for the text+url flavor (it already special-cased email). number/date still fall back to a plain sp-textfield — a pre-existing gap (today's ESP enum already hits this same fallback), tracked separately since it needs a dedicated Spectrum control, not a remap change.
• Backward compatible with legacy direct type values and the old checkbox+displayAs convention.
• Targets rsvp-form-block (this PR's base) rather than dev, since it's a small follow-up on top of the in-review Spectrum 2 block — intended to land as part of/after that PR merges.

Test plan

• Added a full (type, displayAs) → dispatch/rendered-element test matrix in test/unit/blocks/rsvp-form/rsvp-form.test.js, including the documented number/date fallback
• npx wtr — 51/51 tests passing
• npx eslint clean on all three changed files

Co-Authored-By: Claude Sonnet 5 noreply@anthropic.com

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Commits

• c53eeca ✅ (latest)