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/GiteaProvider.php

@@ -0,0 +1,82 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Service\Provider;
+
+use Psr\Log\LoggerInterface;
+use Symfony\Contracts\HttpClient\HttpClientInterface;
+
+/**
+ * Fetches contribution data from the Gitea heatmap endpoint.
+ *
+ * Endpoint: GET /api/v1/users/{username}/heatmap
+ * Returns:  [{"timestamp": 1234567890, "contributions": 3}, ...]
+ *
+ * Required token scopes: read:user
+ */
+final class GiteaProvider implements ProviderInterface
+{
+    use ProbeTrait;
+
+    public function __construct(
+        private readonly HttpClientInterface $client,
+        private readonly string $username,
+        private readonly string $token,
+        private readonly string $baseUrl,
+        private readonly LoggerInterface $logger,
+    ) {}
+
+    public function getName(): string
+    {
+        return 'gitea';
+    }
+
+    public function isConfigured(): bool
+    {
+        return $this->username !== '' && $this->token !== '' && $this->baseUrl !== '';
+    }
+
+    public function ping(): void
+    {
+        $baseUrl = rtrim($this->baseUrl, '/');
+
+        $this->client->request('GET', "$baseUrl/api/v1/user", [
+            'headers' => ['Authorization' => "token {$this->token}"],
+        ])->getContent();
+    }
+
+    /**
+     * @return array<string, int>  date (Y-m-d) => contribution count
+     */
+    public function fetch(): array
+    {
+        $baseUrl = rtrim($this->baseUrl, '/');
+
+        $this->logger->debug('GiteaProvider: fetching contributions', ['user' => $this->username, 'url' => $baseUrl]);
+
+        $response = $this->client->request('GET', "$baseUrl/api/v1/users/{$this->username}/heatmap", [
+            'headers' => ['Authorization' => "token {$this->token}"],
+        ]);
+
+        $data   = $response->toArray();
+        $cutoff = (new \DateTimeImmutable('-365 days'))->getTimestamp();
+        $result = [];
+
+        foreach ($data as $entry) {
+            if ($entry['timestamp'] < $cutoff) {
+                continue;
+            }
+            $date          = date('Y-m-d', $entry['timestamp']);
+            $result[$date] = ($result[$date] ?? 0) + (int) $entry['contributions'];
+        }
+
+        $this->logger->info('GiteaProvider: fetched contributions', [
+            'user'  => $this->username,
+            'days'  => count($result),
+            'total' => array_sum($result),
+        ]);
+
+        return $result;
+    }
+}