YeonGyu-Kim 156a988080 refactor(migration): add backup creation and category migration
- Create timestamped backup before migration writes
- Add migrateAgentConfigToCategory() for model→category migration
- Add shouldDeleteAgentConfig() for cleanup when matching defaults
- Add Prometheus and Metis to agent name map
- Comprehensive test coverage for new functionality

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2026-01-08 23:07:04 +09:00
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