feat: section articles proches dans la vue article

public/index.php

@@ -566,6 +566,51 @@ switch ($action) {
                 $categorySidebar[$aCat][] = $a;
             }
         }
+        // Articles proches : un search par mot du titre → OR implicite, cumul des scores
+        $similarArticles = [];
+        require_once BASE_PATH . '/src/SearchEngine.php';
+        $_simEngine    = new SearchEngine();
+        $_relatedUuids = array_column($relatedArticles, 'uuid');
+        $_stopWords    = ['avec', 'dans', 'pour', 'une', 'les', 'des', 'sur', 'par', 'qui', 'que',
+                          'tout', 'mais', 'donc', 'comment', 'quand', 'plus', 'cette', 'cet', 'ces',
+                          'mon', 'ton', 'son', 'notre', 'votre', 'leur', 'tres', 'bien', 'fait',
+                          'aussi', 'comme', 'plus', 'sans', 'sous', 'entre', 'vers', 'chez'];
+        $_simPool = array_values(array_filter(
+            $_allPublished,
+            static function (array $a) use ($article, $privateCats, $_relatedUuids): bool {
+                if ($a['uuid'] === $article['uuid']) {
+                    return false;
+                }
+                if (in_array($a['uuid'], $_relatedUuids, true)) {
+                    return false;
+                }
+                if (strtotime((string)($a['published_at'] ?? '')) > time() && !isLoggedIn()) {
+                    return false;
+                }
+                $cat = trim($a['category'] ?? '');
+                return $cat === '' || !in_array($cat, $privateCats, true) || isLoggedIn();
+            }
+        ));
+        $_titleWords = array_unique(array_values(array_filter(
+            preg_split('/\W+/u', mb_strtolower($article['title']), -1, PREG_SPLIT_NO_EMPTY) ?: [],
+            fn ($w) => mb_strlen($w) >= 4 && !in_array($w, $_stopWords, true)
+        )));
+        $_scoreMap   = [];
+        $_articleMap = [];
+        foreach ($_titleWords as $_word) {
+            foreach ($_simEngine->search($_word, $_simPool) as $_r) {
+                $_uuid = $_r['article']['uuid'];
+                $_scoreMap[$_uuid]   = ($_scoreMap[$_uuid] ?? 0.0) + $_r['score'];
+                $_articleMap[$_uuid] = $_r['article'];
+            }
+        }
+        arsort($_scoreMap);
+        $similarArticles = array_map(
+            fn ($uuid) => $_articleMap[$uuid],
+            array_slice(array_keys($_scoreMap), 0, 5)
+        );
+        unset($_simEngine, $_simPool, $_titleWords, $_stopWords, $_scoreMap, $_articleMap, $_relatedUuids);
+
         unset($_allPublished);
 
         include BASE_PATH . '/templates/post_view.php';