Remove the Proxy cache adapter

[Meldiron]

What does this PR do?

Deletes Cache\Adapter\Proxy.

It hard-codes one deployment's routing into the library:

new Proxy(
    appDomain: 'app.example.com',
    appDomainAdapter: $cloudflareCache,
    networkAdapter: $fastlyCache,
    customDomainAdapters: [$cloudflareCache, $fastlyCache],
    networkDomains: ['network.example.com'],
);

An app domain, a set of network domains, and a list of adapters for everything else. A consumer whose split is not exactly that cannot use it; a consumer whose split is that has encoded its own topology in a dependency it does not control, and has to ship a library release to change it.

#4 has since established that it cannot route key purges at all — keys are scoped to a Fastly service or a Cloudflare zone, so purgeKeys() now throws and the README tells consumers to pick the adapter themselves before constructing Cache:

$adapter = $cdnAdapterResolver->resolve($rule);

$cache = new Cache($adapter);
$cache->purgeKeys(['domain-' . \strtolower($domain)]);

That is the right conclusion, and it is not specific to keys. Once the consumer is resolving the adapter for one operation it holds the routing context for all of them, and what is left of Proxy is a domain-shaped special case of something the consumer already does.

Nothing uses it. Its only references anywhere were its own test and the README section documenting it — no other class in this library, and no usage in appwrite-labs/cloud, which routes purges itself.

Certificates\Provider\Proxy is a different class and is untouched. Exception\Configuration and Exception\UnsupportedOperation both stay, since the certificate providers still use them.

Test Plan

composer test — 22 tests, 45 assertions, down from 26/49 on main: the four removed are ProxyTest's own, and every other test passes untouched, which is the evidence that nothing depended on it.

composer analyse (level 6) reports [OK] No errors — relevant here because PHPStan would flag any surviving reference to the deleted class. composer lint passes.

I checked for usage by grepping this repository and appwrite-labs/cloud for Adapter\Proxy, Adapter/Proxy and new Proxy( outside the certificates namespace; the only hits were the two files this PR deletes and the README section it removes.

Breaking changes

Removing a public class is breaking for anyone constructing it. The library is 0.0.x and the class is unreferenced in the only consumer I know of.

Related PRs and Issues

Groundwork for #5, which introduces a filter-based Cache\Adapter\Balancer covering the same fan-out need without the library holding a topology.

Note for ordering: #6 currently adds a method to Proxy, so it will need a rebase once this merges — the conflict resolves by dropping that part of it.

Checklist

• I read the contributing guide
• I ran composer lint
• I ran composer analyse
• I ran composer test

🤖 Generated with Claude Code

[greptile-apps]

Greptile Summary

Removes the unused topology-specific cache routing adapter and its associated documentation and tests.

• Deletes Utopia\Cdn\Cache\Adapter\Proxy.
• Removes the README cache-routing example.
• Removes the adapter’s dedicated test suite.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
README.md	Removes documentation and examples for the deleted cache routing adapter.
src/Cdn/Cache/Adapter/Proxy.php	Deletes the unused public cache routing adapter without leaving repository references or class-specific metadata.
tests/Cdn/Cache/Adapter/ProxyTest.php	Removes tests exclusively covering the deleted adapter.

_{Reviews (2): Last reviewed commit: "Remove the Proxy cache adapter" | Re-trigger Greptile}

[Meldiron]

lgtm, #5 adds replacement adapter