SHOAIB SUBSCRIPTION BOT - FAST RESPONSE BUILD

Implemented:
- Meta status/delivery webhooks return before loading DB/bot code.
- Incoming message webhook is acknowledged immediately on PHP-FPM via fastcgi_finish_request().
- PHP sessions are disabled for webhook requests.
- Raw webhook/debug/success Meta logs are disabled in production.
- WhatsApp inbox history writes are deferred until after the live reply.
- Google/Gmail libraries are lazy-loaded only when NayaPay/Gmail verification actually needs them.
- NayaPay schema uses a fast LIMIT 0 probe instead of SHOW/ALTER checks on every top-up step.
- Screenshot waiting message is sent BEFORE media download, Tesseract OCR and Gmail verification.
- Meta outbound cURL uses HTTP/2 when available and millisecond connect/total timeouts.

Important:
No code can guarantee sub-1-second WhatsApp delivery every time because Meta Cloud API, internet, DNS/TLS and hosting load are external. This build minimizes the bot/server-side critical path. For best results use PHP-FPM + OPcache and a server geographically close to Meta endpoints.
