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

refactor: consolidate and deduplicate prompt files

fix: fall back to HuggingFace on empty response instead of hard error

feat: prevent duplicate driver trips at same date and time

refactor: consolidate prompts into base system.md + mode-specific files

feature: modify and delete driver trips

change to (remoteJid)

first commit