merge: feature/initial-deploy-setup — initial 3x-ui/Xray deployment setup

feat: add 3x-ui/Xray Docker deployment setup

Запрос на слияние 'fix/improvements-2026-07-01' (#1) из fix/improvements-2026-07-01 в master

fix: improve security, add TLS, graceful shutdown, fix nginx_handler - 2026-07-01

docs: add open source readiness report - 2025-07-09

feat: prepare project for Open Source release - 2025-07-09

feat: add dotnet as child process and CI/CD pipeline - 2025-07-09

fix: improve security, add TLS, graceful shutdown, fix nginx_handler - 2026-07-01

docs: add open source readiness report - 2025-07-09

feat: prepare project for Open Source release - 2025-07-09

feat: add dotnet as child process and CI/CD pipeline - 2025-07-09