Fix GraphQL coroutine context propagation

Promises\Swoole was already propagating the request container into child
coroutines, but using its own pre-existing key (__utopia_http_request_container)
rather than the new utopia-php/http key (__utopia__). With the keys
mismatched, the propagation was dead code and resolvers spawned from
webonyx coroutines saw an empty context, failing every GraphQL query
with 'Dependency utopia:graphql not found'.

Align the key so child coroutines actually inherit the request's
container (wrapped as a child Container, so request-scoped overrides
in the resolver can't bleed back into the outer request).

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

src/Appwrite/Promises/Swoole.php

@@ -8,7 +8,7 @@ use Utopia\DI\Container;
 
 class Swoole extends Promise
 {
-    private const REQUEST_CONTAINER_CONTEXT_KEY = '__utopia_http_request_container';
+    private const REQUEST_CONTAINER_CONTEXT_KEY = '__utopia__';
 
     public function __construct(?callable $executor = null)
     {