Fix: Avoid loop variable collision in MinIO front-proxy include

Replaced default 'item' with explicit loop variable 'minio_proxy' to prevent
conflicts with inner roles (e.g., sys-stk-front-proxy using with_first_found).

This resolves the undefined variable error and removes the Ansible warning
about the loop variable already being in use.

Reference: https://chatgpt.com/share/692c5778-2b24-800f-b203-5b6b2c9b1d4b

roles/web-app-minio/tasks/main.yml

@@ -9,11 +9,12 @@
   include_role:
     name: sys-stk-front-proxy
   vars:
-    domain:    "{{ item.domain }}"
+    domain:    "{{ minio_proxy.domain }}"
-    http_port: "{{ item.http_port }}"
+    http_port: "{{ minio_proxy.http_port }}"
   loop: "{{ MINIO_FRONT_PROXY_MATRIX }}"
   loop_control:
-    label: "{{ item.domain }} -> {{ item.http_port }}"
+    loop_var: minio_proxy
+    label: "{{ minio_proxy.domain }} -> {{ minio_proxy.http_port }}"
 
 - block:
     - name: "Check policy (RAW with slash) exists"