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* docs: update wiki for RAG engine plugin architecture Replace KnowledgeRetriever component docs with RAGEngine across all three languages (zh/en/ja). Key changes: - Add new rag-engine.mdx component docs covering RAGEngine base class, creation_schema/retrieval_schema, capability declarations, lifecycle hooks, host RAG APIs, and complete code examples - Update knowledge base usage docs to reflect unified KB model (remove internal/external distinction, add RAG engine selection flow) - Update component list (add.mdx) and plugin intro to reference RAGEngine - Add RAG API section to plugin common APIs (invoke_embedding, vector_upsert/search/delete, get_rag_file_stream) - Update docs.json navigation to point to rag-engine pages Companion to LangBot PR #1995 and SDK PR #34. Co-Authored-By: Claude Opus 4.6 <[email protected]> * fix: sync with sdk * docs: update vector API docs with metadata filters, search_type, and documents support - Replace Warning tags about unimplemented filters with Info tags documenting canonical filter format (Chroma-style where syntax) and supported operators - Document search_type/query_text params for full-text and hybrid search - Document documents param for vector_upsert - Update RetrievalContext.filters description from reserved to active - Add filter usage examples (en/zh/ja) Co-Authored-By: Claude Opus 4.6 <[email protected]> * docs: enhance RAG Engine documentation across multiple languages - Expanded the description of the RAG Engine component to include bridging capabilities with advanced knowledge base services like Dify, RAGFlow, and FastGPT. - Clarified the `DOC_INGESTION` capability description, specifying conditions under which the declaration can be omitted. - Updated documentation in English, Japanese, and Chinese to ensure consistency and clarity. * docs: add instructions for show_if conditional rendering * docs: add Parser component documentation (zh/en/ja) Add Parser as a new component type in plugin docs. Parser extracts structured text from binary files (PDF, Word, etc.) before RAG engine ingestion. Includes manifest format, parse method API, data models (ParseContext/ParseResult/TextSection), RAGEngine integration via parsed_content, and cross-plugin invoke_parser API. Also add DOC_PARSING capability to RAG engine docs and parsed_content field to IngestionContext. Companion to SDK PR langbot-app/langbot-plugin-sdk#37 and LangBot PR langbot-app/LangBot#2000. Co-Authored-By: Claude Opus 4.6 <[email protected]> * docs: rename RAGEngine components to KnowledgeEngine * refactor: change rag engine to knowledge engine --------- Co-authored-by: Claude Opus 4.6 <[email protected]> Co-authored-by: Junyan Qin <[email protected]>