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### What problem does this PR solve? This PR adds a new guide: **"RAG failure modes checklist"**. RAG systems often fail in ways that are not immediately visible from a single metric like accuracy or latency. In practice, debugging production RAG applications requires identifying recurring failure patterns across retrieval, routing, evaluation, and deployment stages. This guide introduces a structured, pattern-based checklist (P01–P12) to help users interpret traces, evaluation results, and dataset behavior within RAGFlow. The goal is to provide a practical way to classify incidents (e.g., retrieval hallucination, chunking issues, index staleness, routing misalignment) and reason about minimal structural fixes rather than ad-hoc prompt changes. The change is documentation-only and does not modify any code or configuration. Refs #13138 ### Type of change - [ ] Bug Fix (non-breaking change which fixes an issue) - [ ] New Feature (non-breaking change which adds functionality) - [x] Documentation Update - [ ] Refactoring - [ ] Performance Improvement - [ ] Other (please describe):