Fix booking price resilience and CI workflow noise #3703

Originally written by @ccantynz-alt on GitHub.
Imported from https://github.com/ccantynz-alt/Hibiscus-to-airport/pull/44

Summary

• Booking price fallback: The server-side price recalculation added in the previous PR was hard-failing every booking with a 500 error when GOOGLE_MAPS_API_KEY isn't configured in Vercel. Fixed to fall back gracefully — if the Maps API is available it recalculates server-side (secure); if not it logs a warning and applies a $100 floor, so bookings can still be created. To get full server-side price security, set GOOGLE_MAPS_API_KEY in your Vercel environment variables.
• CI workflow fix: Removed the pull_request trigger from agent-pr.yml. That workflow requires a patch_url input which is only available on workflow_dispatch — running it on every PR push guaranteed a failure on every single PR.

Test plan

• Create a booking — verify it completes without "Could not calculate distance" errors
• Confirm no more make_pr CI failures on future PRs

https://claude.ai/code/session_0128AhV6qVV1cEcCu4AhRP36

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