arrproxy: apply standard branch protection + squash merge

Match the sibling Go service repo convention (node-lookup/encapi):
require the woodpecker pre-commit/test/build PR status checks,
squash merge style, and restrict merge/approval to Owners/benvin.

config/git.unkin.net/unkin/repository/arrproxy.yaml

@@ -2,3 +2,15 @@ description: "Go reverse proxy fronting sonarr/radarr/prowlarr: Authentik oauth
 private: true
 default_branch: "main"
 default_delete_branch_after_merge: true
+default_merge_style: "squash"
+branch_protection:
+  - rule_name: "main"
+    merge_whitelist_teams:
+      - "Owners"
+    enable_push: false
+    status_check_contexts:
+      - "ci/woodpecker/pr/pre-commit"
+      - "ci/woodpecker/pr/test"
+      - "ci/woodpecker/pr/build"
+    approval_whitelist_users:
+      - "benvin"