feat(Docker): Upgrade to PHP 8.5.0RC3 with native ext-uri support

BREAKING CHANGE: Requires PHP 8.5.0RC3

Changes:
- Update Docker base image from php:8.4-fpm to php:8.5.0RC3-fpm
- Enable ext-uri for native WHATWG URL parsing support
- Update composer.json PHP requirement from ^8.4 to ^8.5
- Add ext-uri as required extension in composer.json
- Move URL classes from Url.php85/ to Url/ directory (now compatible)
- Remove temporary PHP 8.4 compatibility workarounds

Benefits:
- Native URL parsing with Uri\WhatWg\Url class
- Better performance for URL operations
- Future-proof with latest PHP features
- Eliminates PHP version compatibility issues

src/Framework/Retry/Strategies/ExponentialBackoffStrategy.php

@@ -16,17 +16,22 @@ use Throwable;
  */
 final readonly class ExponentialBackoffStrategy implements RetryStrategy
 {
+    private Duration $initialDelay;
+    private Duration $maxDelay;
+
     public function __construct(
         private int $maxAttempts = 3,
-        private Duration $initialDelay = new Duration(100), // 100ms
+        ?Duration $initialDelay = null,
         private float $multiplier = 2.0,
-        private Duration $maxDelay = new Duration(10000), // 10s
+        ?Duration $maxDelay = null,
         private bool $useJitter = true,
         private array $retryableExceptions = [
             \RuntimeException::class,
             \Exception::class,
         ]
     ) {
+        $this->initialDelay = $initialDelay ?? Duration::fromMilliseconds(100);
+        $this->maxDelay = $maxDelay ?? Duration::fromSeconds(10);
     }
 
     public function shouldRetry(int $currentAttempt, Throwable $exception): bool