Implement creator studio and upload updates

app/Services/Moderation/Rules/KeywordStuffingRule.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace App\Services\Moderation\Rules;
+
+use App\Contracts\Moderation\ModerationRuleInterface;
+
+class KeywordStuffingRule implements ModerationRuleInterface
+{
+    public function analyze(string $content, string $normalized, array $context = []): array
+    {
+        preg_match_all('/[\p{L}\p{N}]+/u', $normalized, $matches);
+
+        $words = array_values(array_filter($matches[0] ?? [], static fn (string $word): bool => mb_strlen($word) > 1));
+        $totalWords = count($words);
+        $config = app('config')->get('content_moderation.keyword_stuffing', []);
+
+        if ($totalWords < (int) ($config['min_word_count'] ?? 20)) {
+            return [];
+        }
+
+        $frequencies = array_count_values($words);
+        $uniqueRatio = count($frequencies) / max($totalWords, 1);
+        $topFrequency = max($frequencies);
+        $topWordRatio = $topFrequency / max($totalWords, 1);
+
+        $maxUniqueRatio = (float) ($config['max_unique_ratio'] ?? 0.3);
+        $maxSingleWordFrequency = (float) ($config['max_single_word_frequency'] ?? 0.25);
+
+        if ($uniqueRatio >= $maxUniqueRatio && $topWordRatio <= $maxSingleWordFrequency) {
+            return [];
+        }
+
+        arsort($frequencies);
+        $keywords = array_slice(array_keys($frequencies), 0, 5);
+
+        return [[
+            'rule' => 'keyword_stuffing',
+            'score' => app('config')->get('content_moderation.weights.keyword_stuffing', 20),
+            'reason' => sprintf(
+                'Likely keyword stuffing (unique ratio %.2f, top word ratio %.2f)',
+                $uniqueRatio,
+                $topWordRatio
+            ),
+            'links' => [],
+            'domains' => [],
+            'keywords' => $keywords,
+        ]];
+    }
+}