refactor: add circular dependency detection and error handling in DI container

- Introduce `InitializerCycleException` for detailed cycle reporting
- Enhance `InitializerProcessor` fallback with explicit discovery order handling and logging
- Implement proactive cycle detection in `InitializerDependencyGraph`
- Improve `ClassName` and `MethodName` with `Stringable` support

src/Framework/Discovery/InitializerProcessor.php

@@ -9,6 +9,7 @@ use App\Framework\Context\ExecutionContext;
 use App\Framework\Core\ValueObjects\ClassName;
 use App\Framework\Core\ValueObjects\MethodName;
 use App\Framework\DI\Container;
+use App\Framework\DI\Exceptions\InitializerCycleException;
 use App\Framework\DI\Initializer;
 use App\Framework\DI\InitializerDependencyGraph;
 use App\Framework\DI\ValueObjects\DependencyGraphNode;
@@ -121,8 +122,28 @@ final readonly class InitializerProcessor
                     );
                 }
             }
+        } catch (InitializerCycleException $e) {
+            // Spezielle Behandlung für Cycles: Expliziter Fallback mit detailliertem Logging
+            $logger = $this->getLogger();
+            $logger->error(
+                "Circular dependencies detected in initializers, registering in discovery order",
+                LogContext::withExceptionAndData($e, [
+                    'cycles' => $e->getCycles(),
+                    'cycle_count' => $e->getCycleCount(),
+                ])
+            );
+
+            // Fallback: Registriere alle Services in Discovery-Reihenfolge
+            /** @var string $returnType */
+            foreach ($graph->getNodes() as $returnType => $node) {
+                $this->registerLazyService(
+                    $returnType,
+                    $node->getClassName(),
+                    $node->getMethodName()
+                );
+            }
         } catch (\Throwable $e) {
-            // Fallback: Registriere alle Services ohne spezielle Reihenfolge
+            // Andere Fehler: Fallback mit generischer Warnung
             $logger = $this->getLogger();
             $logger->warning(
                 "Failed to register services with dependency graph, falling back to unordered registration",