becb925456
Add four test functions using httptest.NewServer: - TestApplyLabel: verifies POST request path, auth header, label IDs in body, and cache invalidation after success - TestApplyLabel_Error: verifies 404 error propagation - TestSubmitReview: verifies POST path, event/body fields, and cache invalidation after success - TestSubmitReview_Error: verifies 422 error propagation Closes leeworks-agents/gitea-mobile#127 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>