feat: enhance model output parser and add integration guide
Model Output Parser:
- Support multiple dots.ocr output formats (JSON, structured text, plain text)
- Normalize all formats to standard ParsedBlock structure
- Handle JSON with blocks/pages arrays
- Parse markdown-like structured text
- Fallback to plain text parsing
- Better error handling and logging
Schemas:
- Document must-have fields for RAG (doc_id, pages, metadata.dao_id)
- ParsedChunk must-have fields (text, metadata.dao_id, metadata.doc_id)
- Add detailed field descriptions for RAG integration
Integration Guide:
- Create INTEGRATION.md with complete integration guide
- Document dots.ocr output formats
- Show ParsedDocument → Haystack Documents conversion
- Provide DAGI Router integration examples
- RAG pipeline integration with filters
- Complete workflow examples
- RBAC integration recommendations
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