docs: update all chunk flag names to match renamed CLI flags
Replace all occurrences of old ambiguous flag names with the new explicit ones:
--chunk-size (tokens) → --chunk-tokens
--chunk-overlap → --chunk-overlap-tokens
--chunk → --chunk-for-rag
--streaming-chunk-size → --streaming-chunk-chars
--streaming-overlap → --streaming-overlap-chars
--chunk-size (pages) → --pdf-pages-per-chunk
Updated: CLI_REFERENCE (EN+ZH), user-guide (EN+ZH), integrations (Haystack,
Chroma, Weaviate, FAISS, Qdrant), features/PDF_CHUNKING, examples/haystack-pipeline,
strategy docs, archive docs, and CHANGELOG.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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