[Server] Simplify server entrypoint with run-based transport lifecycle (#103)

* feat: replace connect/listen flow with run lifecycle

* feat(transport): add phpstan generics for typed transport returns

* refactor: standardize variable naming for MCP server instances in transport handling

* test: remove unnecessary phpstan-ignore annotation in DocBlockTestFixture

src/Server.php

@@ -35,7 +35,14 @@ final class Server
         return new Builder();
     }
 
-    public function connect(TransportInterface $transport): void
+    /**
+     * @template TResult
+     *
+     * @param TransportInterface<TResult> $transport
+     *
+     * @return TResult
+     */
+    public function run(TransportInterface $transport): mixed
     {
         $transport->initialize();
 
@@ -56,5 +63,11 @@ final class Server
         $transport->onSessionEnd(function (Uuid $sessionId) {
             $this->jsonRpcHandler->destroySession($sessionId);
         });
+
+        try {
+            return $transport->listen();
+        } finally {
+            $transport->close();
+        }
     }
 }