GET /api/v1/bookings/mine (LNbits account auth; identity = the account's
Nostr pubkey, the same value the booking request carried) and RPC twin
chatelet_booking_list_mine (scoped by the signed sender_pubkey). Rows come
back newest check-in first via the m003 guest index, as guest_booking_dict:
the guest's own contact and counts, minus the Lightning/Nostr plumbing.
Declared ahead of /bookings/{booking_id} so 'mine' is not read as an id.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>