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## Summary Dify-compatible retrieval API for external knowledge base integration. ## Changes - **New handler**: DifyRetrievalHandler with POST/GET /api/v1/dify/retrieval - **Health check**: GET /api/v1/dify/retrieval/health - **Full pipeline**: KB validation -> permission check -> embedding -> metadata filter -> chunk retrieval -> child chunk aggregation -> optional KG search -> response assembly - **12 tests** covering all paths (success, errors, metadata filter, KG mode) - **Testability**: Handler dependencies defined as interfaces (KBServiceIface, ModelServiceIface, etc.) ## Files | File | Type | |------|------| | internal/handler/dify_retrieval_handler.go | New — handler + interfaces | | internal/handler/dify_retrieval_handler_test.go | New — 12 tests | | internal/router/router.go | Modified — route registration | | cmd/server_main.go | Modified — handler wiring | | internal/service/kg/pipeline.go | Modified — SetChatModel/SetEmbModel | | internal/service/kg/retrieval.go | New — helper functions | | internal/service/kg/scoring.go | Moved from service package | | internal/service/kg/search.go | New — KG search functions | | internal/service/kg/types.go | New — type definitions | --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>