Fix trip seat filtering and enable null seats display

feat: rebrand FALSA to FALZH with updated supabase schema, tool names, and prompts

feat: replace Hugging Face with Gemini as fallback AI provider

feat: welcome returning drivers discovered from WhatsApp groups

feat: support multiple phone numbers and prevent duplicate customers

feat: skip optional trip fields and accept natural date expressions

add driver name search for passengers

support unregistered drivers from group messages and warm new user onboarding

replace numbered trip list with trip cards for driver delete/modify/list

rename booking leads to trip selections

use phone_number instead of remoteJid for driver notifications

make trip search fields optional; update LLM prompts to search/book immediately with partial info

feat: send trip cards as individual messages and resolve trip_id from replies

feat: prevent duplicate driver trips at same date and time

feature: modify and delete driver trips

change to (remoteJid)

first commit