<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=587135) </details> <!--IssueSummary end--> Implement destroy service for v2 approval rules. Requirements: - Check authorization - Find the approval rule by ID - Validate rule can be deleted (only MR-level rules with `origin: :merge_request`) - Destroy the rule (cascade deletes join table records and approver associations) - Return ServiceResponse with success/error Reference: POC implementation in `poc/v2-approval-rules-complete` branch