refactor(webserver): rename roles and update references

- Rename sys-svc-webserver -> sys-svc-webserver-core
- Rename sys-stk-front-pure -> sys-svc-webserver-https
- Update includes, run_once flags, and docs across:
  * sys-ctl-mtn-cert-renew
  * sys-front-inj-*
  * sys-stk-front-proxy
  * sys-svc-certs
  * sys-svc-cln-domains
  * web-opt-rdr-*
  * web-svc-*
- Remove redundant webserver include in web-opt-rdr-www
- Fix documentation links

Ref: ChatGPT conversation https://chatgpt.com/share/68d6cea2-3570-800f-acb3-c3277317f17b

roles/sys-svc-proxy/README.md

@@ -16,7 +16,7 @@ The goal of this role is to deliver a **hassle-free, production-ready reverse pr
 
 ## Features
 
-- **Automatic TLS & HSTS** — integrates with the *sys-stk-front-pure* role for certificate management.  
+- **Automatic TLS & HSTS** — integrates with the *sys-svc-webserver-https* role for certificate management.  
 - **Flexible vHost templates** — *basic* and *ws_generic* flavours cover standard HTTP and WebSocket applications.  
 - **Security headers** — sensible defaults plus optional X-Frame-Options / CSP based on application settings.  
 - **WebSocket & HTTP/2 aware** — upgrades, keep-alive tuning, and gzip already configured.  

roles/sys-svc-proxy/TODO.md

@@ -2,4 +2,4 @@
 - Optimize buffering
 - Optimize caching
 - Make 'proxy_hide_header Content-Security-Policy' optional by using more_header option. See [ChatGPT Conversation](https://chatgpt.com/share/6825cb39-8db8-800f-8886-0cebdfad575a)
-- Refactor this role - It seems like it's just an wrapper for 'sys-stk-front-pure' which doesn't add any additional logic
+- Refactor this role - It seems like it's just an wrapper for 'sys-svc-webserver-https' which doesn't add any additional logic