DOC-6616 Prefetch queue use case example

[andy-stark-redis]

Don't review yet - this is just to get some early feedback from the Bugbot.

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Note

Medium Risk
Adds a new use-case section plus substantial new Go and .NET demo code and operational guidance, which may introduce broken snippets or inconsistent conventions if not reviewed carefully. No production code paths are affected, but the new samples include concurrency/Redis command semantics that are easy to get subtly wrong.

Overview
Introduces a new prefetch-cache use case and links it from the top-level use-cases index, describing the pattern (bulk pre-load + continuous CDC-style sync, no primary fallback on misses).

Adds two runnable reference implementations: a Go go-redis demo server and helper (BulkLoad, Get, ApplyChange, Clear via SCAN, pause/resume sync worker) and a .NET 8 StackExchange.Redis minimal-API demo with equivalent helper and background sync thread, including key-prefix configurability and UI/stat endpoints.

Updates the porting/audit checklists and conventions to codify new cross-client pitfalls (guarding empty-field HSET, preserving TTL -2/-1 sentinels via raw commands, locked emit ordering, SCAN without admin privileges, and documentation consistency checks for “Get the source files” blocks).

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[github-actions]

Staging links:
https://redis.io/docs/staging/DOC-6616-prefetch-cache-use-case/develop/use-cases/
https://redis.io/docs/staging/DOC-6616-prefetch-cache-use-case/develop/use-cases/prefetch-cache/
https://redis.io/docs/staging/DOC-6616-prefetch-cache-use-case/develop/use-cases/prefetch-cache/dotnet/
https://redis.io/docs/staging/DOC-6616-prefetch-cache-use-case/develop/use-cases/prefetch-cache/go/
https://redis.io/docs/staging/DOC-6616-prefetch-cache-use-case/develop/use-cases/prefetch-cache/java-jedis/
https://redis.io/docs/staging/DOC-6616-prefetch-cache-use-case/develop/use-cases/prefetch-cache/java-lettuce/
https://redis.io/docs/staging/DOC-6616-prefetch-cache-use-case/develop/use-cases/prefetch-cache/nodejs/

[github-actions]

DOC-6616

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[dwdougherty]

Just one minor nitpick; otherwise, LGTM. I only read the Python example, as the others have similar text. I didn't scrutinize the code.

[andy-stark-redis]

Thanks @dwdougherty !

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