Lower Brotli default compression level to 4 (#238)

Brotli defaulted to level 11 (near-max), which is too slow for an HTTP
response path. Set a fast, HTTP-sensible default of 4 and add an
explicit Zstd default of 3. GZIP and Deflate have no public level
setter in utopia-php/compression 0.1.4, so their PHP defaults (6) are
left as-is.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: loks0n

src/Http/Http.php

@@ -15,6 +15,8 @@
 class Http
 {
     public const COMPRESSION_MIN_SIZE_DEFAULT = 1024;
+    public const COMPRESSION_BROTLI_LEVEL_DEFAULT = 4;
+    public const COMPRESSION_ZSTD_LEVEL_DEFAULT = 3;
 
     /**
      * Request method constants

src/Http/Response.php

@@ -2,6 +2,8 @@
 
 namespace Utopia\Http;
 
+use Utopia\Compression\Algorithms\Brotli;
+use Utopia\Compression\Algorithms\Zstd;
 use Utopia\Compression\Compression;
 
 abstract class Response
@@ -625,6 +627,12 @@ public function send(string $body = ''): void
             $algorithm = Compression::fromAcceptEncoding($this->acceptEncoding, $this->compressionSupported);
 
             if ($algorithm) {
+                if ($algorithm instanceof Brotli) {
+                    $algorithm->setLevel(Http::COMPRESSION_BROTLI_LEVEL_DEFAULT);
+                } elseif ($algorithm instanceof Zstd) {
+                    $algorithm->setLevel(Http::COMPRESSION_ZSTD_LEVEL_DEFAULT);
+                }
+
                 $body = $algorithm->compress($body);
                 $this->removeHeader('Content-Length');
                 $this->addHeader('Content-Length', (string) \strlen($body));