Add thread safety test for RayAOP interceptors

Introduces a new PHPT test to ensure concurrent operation safety for RayAOP interceptors. This test registers multiple interceptors quickly and checks their execution to confirm the stability and correctness under concurrent conditions.

tests/008-rayaop-thread-safety.phpt

@@ -0,0 +1,72 @@
+--TEST--
+Test case: 008-rayaop-safety.phpt
+RayAOP concurrent operation safety test
+--SKIPIF--
+<?php
+if (!extension_loaded('rayaop')) {
+    die('skip: rayaop extension not available');
+}
+?>
+--FILE--
+<?php
+// Test concurrent operation safety
+class SafetyTestInterceptor implements Ray\Aop\MethodInterceptorInterface {
+    private $id;
+
+    public function __construct($id) {
+        $this->id = $id;
+    }
+
+    public function intercept(object $object, string $method, array $params): mixed {
+        echo "Interceptor {$this->id} executing\n";
+        $result = $object->$method(...$params);
+        echo "Interceptor {$this->id} completed\n";
+        return $result;
+    }
+}
+
+class TestClass {
+    public function method() {
+        echo "Original method executed\n";
+        return true;
+    }
+}
+
+// Test rapid registration and execution
+method_intercept_init();
+
+// Register multiple interceptors rapidly
+for ($i = 0; $i < 3; $i++) {
+    $result = method_intercept(
+        TestClass::class,
+        'method',
+        new SafetyTestInterceptor($i)
+    );
+    echo "Interceptor {$i} registered: " . ($result ? 'true' : 'false') . "\n";
+}
+
+// Execute method multiple times
+$test = new TestClass();
+for ($i = 0; $i < 2; $i++) {
+    echo "\nExecution #{$i}:\n";
+    $result = $test->method();
+    echo "Result: " . ($result ? 'true' : 'false') . "\n";
+}
+
+?>
+--EXPECT--
+Interceptor 0 registered: true
+Interceptor 1 registered: true
+Interceptor 2 registered: true
+
+Execution #0:
+Interceptor 2 executing
+Original method executed
+Interceptor 2 completed
+Result: true
+
+Execution #1:
+Interceptor 2 executing
+Original method executed
+Interceptor 2 completed
+Result: true