Guillaume Faas 94bc3f8d07 docs(csharp): add C# snippets (#48537) ...

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## Summary by CodeRabbit

* **Documentation**
* Added C# examples across API, authentication, database, Realtime, and
Storage guides.
* Expanded authentication coverage for passwordless, phone, anonymous,
identity linking, SSO, sign-out, and social login providers.
* Added database examples for queries, functions, joins, JSON, arrays,
search, PostGIS, and custom schemas.
* Added Realtime examples for broadcasts, presence, subscriptions, and
database changes.
* Added Storage examples for buckets, uploads, downloads,
transformations, CDN purging, and resumable transfers.
  * Included C# error-handling guidance and relevant reference links.
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2026-08-03 13:13:55 +02:00

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error-codes.mdx

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