root ae72b180e5 fix: improve error handling and validation
- Add centralized exception classes
- Validate signature request status before signing
- Check contract status before approval/rejection
- Add exception handlers to FastAPI app
- Update tests for new validation logic

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-01 03:38:20 +08:00
2026-05-01 03:05:55 +08:00
2026-05-01 03:05:55 +08:00
Description
AI Legal Assistant backend service
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