feat: add PrestaShop support and preset

[matbrgz]

Description

Closes #268.

This PR adds first-class support for PrestaShop to nginxconfig.io, including:

1. PrestaShop NGINX Configuration Generator (src/nginxconfig/generators/conf/prestashop.conf.js):
   • Official image rewrite hierarchy (^/(\d)...).
   • Web service API dispatcher route (/api/... -> /webservice/dispatcher.php).
   • Protection of sensitive directories (app, bin, cache, config, vendor, etc.) and file extensions (.log, .tpl, .twig, .sass, .yml).
   • Prevention of direct PHP file execution in /img/ and /upload/.
   • Dedicated administration location block (/admin-dev/).
2. Domain PHP Section: Added prestashopRules toggle option.
3. Domain Presets: Added the PrestaShop preset button under the Presets section.
4. Localization (i18n): Full localization strings added across all 11 supported language packs (de, en, es, fa, fr, ja, pl, pt-br, ru, zh-cn, zh-tw).
5. Backwards Compatibility: Added prestashop mapping in angular_backwards_compatibility.js.

Verification

• Tested with npm run test:i18n-packs (all 11 language packs verified with no missing/unexpected keys).
• Tested with npm run test:jest (all unit tests passing).
• Tested with prettier and eslint via lint-staged.