YueGuobin 161b7feb01 feat(api): add optimistic locking to LLM model config updates
- Include `version` field in all LLM model config response schemas
- Add `expected_version` parameter to update endpoints for optimistic locking
- Handle concurrent modification errors with HTTP 409 Conflict status
- Update both user and group config endpoints consistently
2026-03-03 16:59:12 +08:00
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