fix(webserver): ensure numeric casting for worker_processes and worker_connections

- Cast WEBSERVER_CPUS_EFFECTIVE to float before comparison to avoid
  'AnsibleUnsafeText < int' type errors.
- Ensure correct numeric coercion for pids_limit values.
- This prevents runtime templating errors when rendering nginx config.

Ref: https://chatgpt.com/share/68d3b047-56ac-800f-a73f-2fb144dbb7c4

group_vars/all/05_webserver.yml

@@ -43,8 +43,8 @@ WEBSERVER_CPUS_EFFECTIVE: >-
 # - else → floor to int
 WEBSERVER_WORKER_PROCESSES: >-
   {{
-    1 if WEBSERVER_CPUS_EFFECTIVE < 1
-    else (WEBSERVER_CPUS_EFFECTIVE | int)
+    1 if (WEBSERVER_CPUS_EFFECTIVE | float) < 1
+    else (WEBSERVER_CPUS_EFFECTIVE | float | int)
   }}
 
 # worker_connections from pids_limit (use the smaller one), with correct key/defaults