feat(web-app-magento): add Magento role + network/ports

- add role files (docs, vars, config, tasks, schema, templates)

- networks: add web-app-magento 192.168.103.208/28

- ports: add localhost http 8052

Conversation: https://chatgpt.com/share/68b8820f-f864-800f-8819-da509b99cee2

roles/web-app-magento/README.md

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+# Magento
+
+## Description
+
+**Magento (Adobe Commerce Open Source)** is a powerful, extensible e-commerce platform built with PHP. It supports multi-store setups, advanced catalog management, promotions, checkout flows, and a rich extension ecosystem.
+
+## Overview
+
+This role deploys **Magento 2** via Docker Compose. It is aligned with the Infinito.Nexus stack patterns:
+- Reverse-proxy integration (front proxy handled by platform roles)
+- Optional **central database** (MariaDB) or app-local DB
+- **OpenSearch** for catalog search (required by Magento 2.4+)
+- Optional **Redis** cache/session (can be toggled)
+- Health checks, volumes, and environment templating
+- SMTP wired via platform's `SYSTEM_EMAIL` settings
+
+For setup & operations, see:
+- [Installation.md](./Installation.md)
+- [Administration.md](./Administration.md)
+- [Upgrade.md](./Upgrade.md)
+- [User_Administration.md](./User_Administration.md)
+
+## Features
+
+- **Modern search:** OpenSearch out of the box (single-node).
+- **Flexible DB:** Use platform's central MariaDB or app-local DB.
+- **Optional Redis:** Toggle cache/session backend.
+- **Proxy-aware:** Exposes HTTP on localhost, picked up by front proxy role.
+- **Automation-friendly:** Admin user seeded from inventory variables.
+
+## Further Resources
+
+- Magento Open Source: https://magento.com/
+- DevDocs: https://developer.adobe.com/commerce/
+- OpenSearch: https://opensearch.org/
+
+## License / Credits
+
+Developed and maintained by **Kevin Veen-Birkenbach**.  
+Learn more at [veen.world](https://www.veen.world).
+
+Part of the [Infinito.Nexus Project](https://s.infinito.nexus/code)  
+Licensed under [Infinito.Nexus NonCommercial License](https://s.infinito.nexus/license).