docs: document Feast Redis online-service performance

[typhoonzero]

Summary

• Add a reproducible in-cluster benchmark for the Feast online-feature service.
• Record the x86 SQLite baseline and Redis 7.2 performance results, including concurrency/error observations.
• Link to ACP Alauda Cache Service for Redis OSS guidance for production online-feature SLAs.
• Link to the Feast Redis online-store and SQL-registry configuration guide.

Validation

• Notebook parses as valid JSON.
• yarn lint passes with 0 errors and 0 warnings.
• git diff --check passes.
• Reduced benchmark execution returned 20/20 complete feature responses with zero errors.

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