fix: add repository block to settings.yml for allow_auto_merge

.github/settings.yml

@@ -1,6 +1,13 @@
 # Repository settings managed via probot/settings
 # https://github.com/probot/settings
 
+# Repository-level settings — standard defaults
+# Reference: https://github.com/petry-projects/.github/blob/main/standards/github-settings.md#repository-settings--standard-defaults
+repository:
+  allow_auto_merge: true
+  delete_branch_on_merge: true
+  has_wiki: false
+
 # Labels — standard set
 # Reference: https://github.com/petry-projects/.github/blob/main/standards/github-settings.md#labels--standard-set
 labels: