Fixes and improvements to Services V2 and conversational AI

The Services V2 booking pages have undergone several improvements related to pricing, variants, multi-service bookings, and location management. Prices are now displayed more consistently, surcharges per coach are more clearly identified, and summaries are easier to read. Conversational AI has also become more reliable with the correction of Knowledge Base Service hallucinations. Adjustments have also been made to variant selection, additional options, and behaviors related to single- or multi-site locations.