security: remove hardcoded SMTP password, use env vars

feat: configure Mail.ru SMTP for lead form

feat: add PHP form with validation (replaces Yandex.Forms buttons)

chore: simplify Dockerfile (pre-built dist) and commit dist for Docker deploy

feat: add Dockerfile for nginx static hosting

fix: add npm start script for App Platform autostart

fix: добавлен run_cmd для App Platform

fix: откат формы на Яндекс Формы, убрана зависимость от serverless API

fix: correct method name createTransport (not createTransporter)

fix: use Node.js 20 LTS for nodemailer compatibility

fix: explicit commonjs type for nodemailer

fix: update package-lock.json for backend dependencies

feat: backend for form handler with email

fix: add fast HEAD response for health checks

feat: replace serve with custom Node.js static server

feat: add start script for Timeweb deployment

fix: add missing FormData declaration in forms + TypeScript cast

refactor: switch to static build + cloud function for forms

fix: add start.sh wrapper to force HOST=0.0.0.0

fix: hardcode server host 0.0.0.0 in astro config