Fix: switch email to Brevo HTTP API (bypasses HF SMTP port blocking)

Added email code verif

[Deployment Phase 1 & 2] - Neon DB and R2 with working turnstile in login page implemented

[Feature Added] > Added Cloudflare Turnstile captcha for better security and bot disengagement. Also updated features, like file_routes, auth_routes to support Turnstile.

Initial commit of full project [remaining backend some parts and frontend to be done yet]