bindings/python: align max_connections default with engine #5352 (16 -> 32) + document Vamana semantics

[tae898]

Follows up #5352: the Python wrapper (create_vector_index) carried its own max_connections=16 default, now inconsistent with the engine's new default of 32. This aligns the wrapper and updates all bindings docs/examples with the documented semantics (per-layer Vamana degree, not hnswlib M; use 2*M to reproduce an hnswlib configuration).

• wrapper default 16 -> 32, docstring documents the 2*M mapping
• docs (api/vector, api/schema, api/database, guide/vectors, testing) and examples 11/13 updated
• full suite green (353 passed)

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https://claude.ai/code/session_01KPPtpXXDs5EZFmx9DAPnRB

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[gemini-code-assist]

Code Review

This pull request updates the Python bindings and examples. It replaces references to the "real_ladybug" package with "ladybug" in the StackOverflow OLTP and OLAP examples. Additionally, it increases the default value for "max_connections" (or "maxConnections") from 16 to 32 across vector index building, hybrid queries, and the core embedded API, updating the corresponding documentation and help messages to reflect this change and explain its relation to JVector/Vamana per-layer degree. There are no review comments, so no feedback is provided.

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[codacy-production]

Up to standards ✅

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