Allow drivers to publish trips in their own style; add reply_instruction for no-match results; improve privacy prompts

Fix Arabic brand spelling by normalizing incorrect variants in AI replies and strengthen system prompt guidance

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

feat: replace Hugging Face with Gemini as fallback AI provider

support unregistered drivers from group messages and warm new user onboarding

refactor: consolidate and deduplicate prompt files

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

first commit