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 sizable new runnable demo code (Go and .NET) including background sync and Redis write paths; risk is mostly doc/demo correctness and build/runtime issues rather than production logic.

Overview
Adds a new Prefetch cache use case to /develop/use-cases, describing the pattern (bulk pre-load + ongoing CDC-style sync) and listing per-language guides.

Introduces full runnable reference implementations for Go (go-redis) and .NET (StackExchange.Redis) demos, including a mock primary store emitting change events, a background sync worker with pause/resume for maintenance actions, and cache helpers that bulk-load, apply upserts/deletes, clear via SCAN, and expose TTL/stats.

Updates internal porting/audit checklists and conventions to capture newly-learned pitfalls: guarding empty-field HSET, preserving TTL -2/-1 sentinels (via raw TTL commands where wrappers lose them), locked mutate+emit ordering, and minor source-download checklist tightening.

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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.

[dwdougherty]

It wouldn't hurt to define "P95". I'd never seen the term before, so I had to look it up.