Add ChunkingStrategy type ('token' | 'question') and wire it through
the ingest pipeline. Users can now choose between traditional token-window
chunking and question-based chunking (Q&A pair detection, table extraction).
Frontend changes:
- RAGDatabasePage: radio buttons for Token vs Question strategy
- DocumentList: strategy badges (blue 'chunked by question' / gray 'chunked by token')
- ChunkList: question-strategy chunks show Q&A metadata (question ID, topic,
page range, 'contains table' badge) instead of raw page numbers
- api.ts / queries.tsx: pass strategy param to /ingest endpoint
- types/index.ts: new ChunkingStrategy type, new fields on ChunkInfo,
DocumentInfo, IngestResponse
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