Finish your deployment setup.

Set these runtime variables in Hostinger:

• SUPABASE_URL
• SUPABASE_ANON_KEY (publishable or legacy anon key only)
• SESSION_SECRET (64 hexadecimal characters)
• APP_URL (your HTTPS domain)

Use SETUP-HOSTINGER.md and sql/setup.sql from the ZIP. Build success does not require these variables, but sign-in and saved data do.