refactor(objstore): extract MinIO into dedicated role 'web-app-minio' and adjust AI role

• Rename ports: web-app-ai_minio_* → web-app-minio_* in group_vars

• Remove MinIO from web-app-ai (service, volumes, ENV)

• Add new role web-app-minio (config, tasks, compose, env, vars) incl. front-proxy matrix

• AI role: front-proxy loop via matrix; unify domain/port vars (OPENWEBUI/Flowise *_PORT_PUBLIC/_PORT_INTERNAL, *_DOMAIN)

• Update compose templates accordingly

Ref: https://chatgpt.com/share/68d15cb8-cf18-800f-b853-78962f751f81

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

@@ -0,0 +1,24 @@
+---
+- name: "load docker and db for {{ application_id }}"
+  include_role:
+    name: sys-stk-back-stateless
+  vars:
+    docker_compose_flush_handlers: false
+
+- name: "create {{ AI_LITELLM_CONFIG_PATH_HOST }}"
+  template:    src:  "litellm.config.yaml.j2" 
+    dest: "{{ AI_LITELLM_CONFIG_PATH_HOST }}"
+  notify: docker compose up
+
+- name: "flush handlers of docker compose"
+  meta: flush_handlers
+
+- name: "Include role sys-stk-front-proxy for each UI domain"
+  include_role:
+    name: sys-stk-front-proxy
+  vars:
+    domain:    "{{ item.domain }}"
+    http_port: "{{ item.http_port }}"
+  loop: "{{ AI_FRONT_PROXY_MATRIX }}"
+  loop_control:
+    label: "{{ item.domain }} -> {{ item.http_port }}"