docs: add custom address resolution guide

[Aryex]

Summary

Add documentation for the custom address resolution feature, covering C# and PHP client support.

Source Commits

• 7a822d4 — Support custom socket address resolution (#392)
• 8f00aae — feat: add address resolver support for standalone and cluster clients (Add JSON module commands docs valkey-io/valkey-glide-docs#196)

Changes

• Added new guide page how-to/connections/address-resolver.mdx documenting the custom address resolution feature
• Added navigation entry in astro.config.mjs under the Connections section
• Added PHP tab with examples for ValkeyGlide (standalone) and ValkeyGlideCluster clients

Context

This is a cross-language feature allowing users to intercept and rewrite server addresses before connection. Useful for DNS overrides, service mesh scenarios, or testing with fake addresses.

• C# PR Support custom socket address resolution valkey-io/valkey-glide-csharp#392 adds AddressResolverDelegate and WithAddressResolver() to the C# client configuration builders.
• PHP PR feat: add address resolver support for standalone and cluster clients valkey-io/valkey-glide-php#196 adds an optional ?callable $address_resolver parameter to ValkeyGlide::connect() and ValkeyGlideCluster::__construct(). The callable receives (string $host, int $port) and returns ['host' => ..., 'port' => ...].

cc @affonsov

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This PR was generated by the doc-trigger pipeline.

[Aryex]

📝 Updated PR description with 8f00aae — feat: add address resolver support for standalone and cluster clients (valkey-io#196)