refactor: reorganise Service/ into Provider/ and Renderer/ sub-namespaces

Move all provider-related classes, enums, interface and trait into
App\Service\Provider; move SvgRenderer into App\Service\Renderer.
ContributionAggregator stays at the Service root as the orchestrator.
Test namespaces and use statements updated to match.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/Service/Provider/ProviderStatus.php

@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service\Provider;
+
+final class ProviderStatus
+{
+    public function __construct(
+        public readonly string $name,
+        public readonly ProviderStatusType $status,
+        public readonly ?ProviderErrorCode $error = null,
+        public readonly ?string $message = null,
+    ) {}
+
+    /** @return array<string, string> */
+    public function toArray(): array
+    {
+        $data = ['status' => $this->status->value];
+        if ($this->error !== null) {
+            $data['error'] = $this->error->value;
+        }
+        if ($this->message !== null) {
+            $data['message'] = $this->message;
+        }
+
+        return $data;
+    }
+}