refactor(clickhouse): migrate HTTP transport from utopia-php/fetch to utopia-php/client

The old transport (utopia-php/fetch) does curl_init() → curl_exec() →
curl_close() per call. The handle's connection cache is destroyed with
it, so every query opens a brand-new TCP+TLS socket — keep-alive
headers are advertised but never honored. Under bursty load this
exhausts ephemeral ports on the calling pod with TIME_WAIT entries
(tcp_fin_timeout=60s), and the kernel queues additional connect()
calls until ports free.

Migrate to utopia-php/client, a PSR-18 client that supports persistent
connection pooling via withConnectionReuse(). The cURL handle now
survives across requests — the TCP/TLS handshake is paid once per
adapter, every subsequent query reuses the warm socket.

Changes:

- Constructor: build a single Client((new CurlAdapter())
  ->withConnectionReuse()) with the auth headers and 30s timeout
  applied via the immutable with* builder pattern.
- query() and insert(): build PSR-7 Requests via the factory
  (RequestFactory::form() for SELECT, RequestFactory::body() for the
  ndjson INSERT body) and dispatch via $client->sendRequest().
  No more per-call addHeader/removeHeader mutations on a shared client.
- setTimeout() now does an immutable rebuild ($client = $client
  ->withTimeout(seconds)).
- setKeepAlive() preserved as a no-op for source-compat — connection
  reuse is now an adapter-level property, not a per-request header.
  Callers that previously passed false to "disable" reuse will see
  reuse enabled regardless; this is the intended behavior and the
  reason the migration is worth doing.

PHP requirement bumps to >=8.4 to match utopia-php/client.

phpstan/phpstan bumped to ^2.0 to handle PHP 8.4 syntax in
utopia-php/client (chained method-on-new-expression). 96 pre-existing
errors flagged by PHPStan 2.x are grandfathered via a generated
baseline so this PR doesn't conflate I/O migration with a typing
sweep.

Refs: appwrite-labs/cloud#4453 — companion stop-gap that disables
keep-alive on the cloud side. Once this lands and propagates, that
workaround becomes unnecessary because the underlying socket pool now
actually works.

Author: lohanidamodar

composer.json

@@ -12,21 +12,21 @@
     "scripts": {
         "lint": "./vendor/bin/pint --test",
         "format": "./vendor/bin/pint",
-        "check": "./vendor/bin/phpstan analyse --level max src tests",
+        "check": "./vendor/bin/phpstan analyse -c phpstan.neon",
         "test": "./vendor/bin/phpunit --configuration phpunit.xml --testsuite \"Test Suite\"",
         "bench": "./vendor/bin/phpunit --configuration phpunit.xml --testsuite Benchmark"
     },
     "minimum-stability": "stable",
     "require": {
-        "php": ">=8.0",
-        "utopia-php/fetch": "^1.1",
+        "php": ">=8.4",
+        "utopia-php/client": "^0.1",
         "utopia-php/database": "5.*|6.0.*",
         "utopia-php/query": "0.1.*"
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5",
         "utopia-php/cache": "^3.0",
-        "phpstan/phpstan": "1.*",
+        "phpstan/phpstan": "^2.0",
         "laravel/pint": "1.*"
     },
     "autoload": {