Implemented full async Gitea REST API v1 client using httpx with the following methods:
- create_pull_request: Create PRs with title, head, base, and body
- merge_pull_request: Merge PRs with configurable merge type
- create_issue_comment: Post comments on issues/PRs
- get_issue: Fetch issue/PR details
- get_issue_comments: Retrieve all comments for an issue/PR
- create_branch: Create new branches from existing ones
Added lazy singleton pattern with get_gitea_client() factory function that reads GITEA_URL and GITEA_TOKEN from environment.
All methods properly call raise_for_status() and return JSON responses. Comprehensive test suite with 8 tests covering all methods plus error handling.
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