docs(indexing): add rabitq performance guide

[BubbleCal]

Feature

What is the new feature?

• Adds a new RaBitQ indexing guide that explains the recent IVF_RQ improvements for users: p99 latency, QPS/core, recall, serving memory, multi-bit reranking, SIMD, fast rotation, and approx_mode tradeoffs.
• Adds SVG benchmark charts for p99 latency, QPS per core, recall, serving memory, and approx_mode modes.
• Adds a tested Python IvfRq(num_bits=5) snippet and links the new guide from indexing navigation, indexing overview, and quantization docs.

Why do we need this feature?

• Users evaluating IVF_RQ need a higher-level, marketing-friendly explanation of why multi-bit RaBitQ can deliver higher recall and lower tail latency without relying on raw-vector refine.
• The page clarifies the memory tradeoff versus IVF_PQ: PQ can stay small without refine, but high recall commonly needs raw vectors in the hot serving path, while multi-bit IVF_RQ can rerank with compact quantized codes.
• It also explains how approx_mode lets users adjust recall/performance per query instead of rebuilding indexes.

How does it work?

• Creates docs/indexing/rabitq.mdx with benchmark tables, SVG charts, implementation explanation, query-time mode guidance, and a short IVF_RQ setup snippet.
• Updates docs/docs.json so the page appears under Indexing.
• Updates existing indexing and quantization docs so their RaBitQ descriptions mention multi-bit support and link to the new guide.
• Adds a test_rabitq_create_index snippet source in tests/py/test_indexing.py and regenerates docs/snippets/indexing.mdx.

Validation

• jq empty docs/docs.json
• git diff --check
• uv run pytest tests/py/test_indexing.py -k rabitq_create_index
• uv run pytest tests/py/test_indexing.py
• Local link/asset existence check for the new page, navigation entry, and SVGs

Mintlify validation note: mint broken-links could not be run because mint, node, npm, and npx are not installed in this environment.

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