Add recrawl functionality and fix PHPCS warnings

- Added "Recrawl" button in jobs table UI
- Implemented recrawl API endpoint that deletes all job data and restarts crawl
- Fixed PHPCS line length warnings in api.php and Crawler.php

All quality checks pass:
- PHPStan Level 8: 0 errors
- PHPCS PSR-12: 0 warnings

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

src/api.php

@@ -127,6 +127,42 @@ try {
             ]);
             break;
 
+        case 'recrawl':
+            $jobId = $_POST['job_id'] ?? 0;
+            $domain = $_POST['domain'] ?? '';
+
+            if (empty($domain)) {
+                throw new Exception('Domain is required');
+            }
+
+            // Delete all related data for this job
+            $stmt = $db->prepare("DELETE FROM crawl_queue WHERE crawl_job_id = ?");
+            $stmt->execute([$jobId]);
+
+            $stmt = $db->prepare("DELETE FROM links WHERE crawl_job_id = ?");
+            $stmt->execute([$jobId]);
+
+            $stmt = $db->prepare("DELETE FROM pages WHERE crawl_job_id = ?");
+            $stmt->execute([$jobId]);
+
+            // Reset job status
+            $stmt = $db->prepare(
+                "UPDATE crawl_jobs SET status = 'pending', total_pages = 0, total_links = 0, " .
+                "started_at = NULL, completed_at = NULL WHERE id = ?"
+            );
+            $stmt->execute([$jobId]);
+
+            // Start crawling in background
+            $cmd = "php " . __DIR__ . "/crawler-worker.php $jobId > /dev/null 2>&1 &";
+            exec($cmd);
+
+            echo json_encode([
+                'success' => true,
+                'job_id' => $jobId,
+                'message' => 'Recrawl started'
+            ]);
+            break;
+
         default:
             throw new Exception('Invalid action');
     }

src/classes/Crawler.php

@@ -211,8 +211,8 @@ class Crawler
 
                 // Save link
                 $stmt = $this->db->prepare(
-                    "INSERT INTO links (page_id, crawl_job_id, source_url, target_url, link_text, is_nofollow, is_internal)
-                    VALUES (?, ?, ?, ?, ?, ?, ?)"
+                    "INSERT INTO links (page_id, crawl_job_id, source_url, target_url, " .
+                    "link_text, is_nofollow, is_internal) VALUES (?, ?, ?, ?, ?, ?, ?)"
                 );
                 $stmt->execute([
                     $pageId,

src/index.php

@@ -338,6 +338,7 @@
                             <td>${job.started_at || '-'}</td>
                             <td>
                                 <button class="action-btn" onclick="viewJob(${job.id})">Ansehen</button>
+                                <button class="action-btn" onclick="recrawlJob(${job.id}, '${job.domain}')">Recrawl</button>
                                 <button class="action-btn" onclick="deleteJob(${job.id})">Löschen</button>
                             </td>
                         </tr>
@@ -472,6 +473,31 @@
             }
         }
 
+        async function recrawlJob(jobId, domain) {
+            if (!confirm('Job-Ergebnisse löschen und neu crawlen?')) return;
+
+            const formData = new FormData();
+            formData.append('job_id', jobId);
+            formData.append('domain', domain);
+
+            try {
+                const response = await fetch('/api.php?action=recrawl', {
+                    method: 'POST',
+                    body: formData
+                });
+                const data = await response.json();
+
+                if (data.success) {
+                    loadJobs();
+                    alert('Recrawl gestartet! Job ID: ' + data.job_id);
+                } else {
+                    alert('Fehler: ' + data.error);
+                }
+            } catch (e) {
+                alert('Fehler beim Recrawl: ' + e.message);
+            }
+        }
+
         function switchTab(tab) {
             document.querySelectorAll('.tab').forEach(t => t.classList.remove('active'));
             document.querySelectorAll('.tab-content').forEach(c => c.classList.remove('active'));