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"@gsxdsm/fusion": minor
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Add batch GitHub issue import with intelligent throttling

- New `POST /api/github/issues/batch-import` endpoint for importing multiple issues sequentially
- Throttled request utility with exponential backoff and Retry-After header support
- Rate limit protection: 1 batch request per 10 seconds per IP
- Frontend API client function `apiBatchImportGitHubIssues()` with full type support
- Comprehensive test coverage for retry logic, validation, and error handling