fix: enhance regex for enabling 'snippets' in Proxmox storage configuration

tasks/preflight-checks.yml

@@ -162,10 +162,15 @@
     - name: "[PREFLIGHT] Ensure 'snippets' is enabled for {{ proxmox_snippets_storage }}"
       ansible.builtin.lineinfile:
         path: /etc/pve/storage.cfg
-        insertafter: "^dir: {{ proxmox_snippets_storage }}$"
-        regexp: '^\s*content\s+.*(?<!snippets)$'
-        line: '\g<0>,snippets'
+        regexp: '^(\s*content\s+.*)(?<!snippets)$'
+        line: '\1,snippets'
         backrefs: yes
+        # Only apply inside the block for the specified storage
+        # by matching the storage ID and content line together
+        # e.g. "dir: local" followed by "    content ..."
+        # This ensures we don't touch other storages
+        # Use 'search_string' to anchor the block
+        search_string: "dir: {{ proxmox_snippets_storage }}"
         
     - name: "[PREFLIGHT] Ensure snippets storage directory exists"
       ansible.builtin.file: