Refactor: migrate cmp/* and srv/* roles into sys-stk/* and sys-svc/* namespaces

- Removed obsolete 'cmp' category, introduced 'stk' category (fa-bars-staggered icon).
- Renamed roles:
  * cmp-db-docker → sys-stk-back-stateful
  * cmp-docker-oauth2 → sys-stk-back-stateless
  * srv-domain-provision → sys-stk-front
  * cmp-db-docker-proxy → sys-stk-full-stateful
  * cmp-docker-proxy → sys-stk-full-stateless
  * cmp-rdbms → sys-svc-rdbms
- Updated all include_role references, vars, templates and README.md files.
- Adjusted run_once comments and variable paths accordingly.
- Updated all web-app roles to use new sys-stk/* and sys-svc/* roles.

Conversation: https://chatgpt.com/share/68b0ba66-09f8-800f-86fc-76c47009d431

roles/sys-stk-front/README.md

@@ -0,0 +1,35 @@
+# Nginx Domain Setup 🚀
+
+## Description
+
+This role bootstraps **per-domain Nginx configuration**: it requests TLS certificates, applies global modifiers, deploys a ready-made vHost file, and can optionally lock down access via OAuth2.
+
+## Overview
+
+A higher-level orchestration wrapper, *sys-stk-front* ties together several lower-level roles:
+
+1. **`sys-srv-web-inj-compose`** – applies global tweaks and includes.  
+2. **`srv-tls-core`** – obtains Let’s Encrypt certificates.  
+3. **Domain template deployment** – copies a Jinja2 vHost from *srv-proxy-core*.  
+4. **`web-app-oauth2-proxy`** *(optional)* – protects the site with OAuth2.
+
+The result is a complete, reproducible domain rollout in a single playbook task.
+
+## Purpose
+
+Provide **one-stop, idempotent domain provisioning** for Nginx-based homelabs or small production environments.
+
+## Features
+
+- **End-to-end TLS** — certificate retrieval and secure headers included.  
+- **Template-driven vHosts** — choose *basic* or *ws_generic* flavours (or your own).  
+- **Conditional OAuth2** — easily toggle authentication per application.  
+- **Handler-safe** — automatically triggers an Nginx reload when templates change.  
+- **Composable** — designed to be called repeatedly for many domains.
+
+## Credits 📝
+
+Developed and maintained by **Kevin Veen-Birkenbach**.  
+Learn more at <https://www.veen.world>
+
+Part of the **Infinito.Nexus Project** — licensed under the [Infinito.Nexus NonCommercial License](https://s.infinito.nexus/license)