Fix trip seat filtering and enable null seats display

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

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

switch to driver immediately if account exists; only ask name on first time

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

feature: modify and delete driver trips

change to (remoteJid)

first commit