Exclude dobetternorge.no docs from all corpus search modes

BM25: adds NOT LIKE filter to SQL WHERE in both FULLTEXT and LIKE paths.
Hybrid + Vector: post-filter hits array by source_url after results return.

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

api/corpus-search.php

@@ -14,6 +14,8 @@ $language = dbnToolsNormalizeLanguage($input['language'] ?? 'en');
 $limit    = max(1, min(20, (int)($input['limit'] ?? 8)));
 $category = isset($input['category']) && $input['category'] !== '' ? trim((string)$input['category']) : null;
 
+const EXCLUDED_DOMAIN = 'dobetternorge.no';
+
 if (mb_strlen($query, 'UTF-8') < 3) {
     dbnToolsError('Query must be at least 3 characters.', 422, 'query_too_short');
 }
@@ -33,6 +35,7 @@ try {
             'source_url'  => $h['source_url'] ?? null,
             'language'    => null,
         ], $result['hits'] ?? []);
+        $hits = array_values(array_filter($hits, fn($h) => !str_contains($h['source_url'] ?? '', EXCLUDED_DOMAIN)));
         dbnToolsRespond(['ok' => true, 'hits' => $hits, 'mode' => 'hybrid', 'query' => $query]);
     }
 
@@ -41,6 +44,7 @@ try {
     // ── BM25: FULLTEXT with LIKE fallback ───────────────────────────────────
     if ($mode === 'bm25') {
         $catClause = $category !== null ? ' AND d.category = ?' : '';
+        $excludeLike = '%' . EXCLUDED_DOMAIN . '%';
 
         // Try FULLTEXT index first
         try {
@@ -52,10 +56,11 @@ try {
                     JOIN documents d ON c.document_id = d.id
                     WHERE d.corpus_id = ? AND d.status = 'ready'
                       AND MATCH(c.content) AGAINST (? IN BOOLEAN MODE) > 0
+                      AND d.source_url NOT LIKE ?
                     $catClause
                     ORDER BY score DESC
                     LIMIT ?";
-            $params = [$query, 1, $query];
+            $params = [$query, 1, $query, $excludeLike];
             if ($category !== null) $params[] = $category;
             $params[] = $limit;
             $stmt = $ragDb->prepare($sql);
@@ -72,10 +77,11 @@ try {
                     JOIN documents d ON c.document_id = d.id
                     WHERE d.corpus_id = ? AND d.status = 'ready'
                       AND (c.content LIKE ? OR d.title LIKE ?)
+                      AND d.source_url NOT LIKE ?
                     $catClause
                     ORDER BY (d.title LIKE ?) DESC
                     LIMIT ?";
-            $params = [1, $like, $like];
+            $params = [1, $like, $like, $excludeLike];
             if ($category !== null) $params[] = $category;
             $params[] = $like;
             $params[] = $limit;
@@ -152,6 +158,7 @@ try {
             ];
         }
 
+        $hits = array_values(array_filter($hits, fn($h) => !str_contains($h['source_url'] ?? '', EXCLUDED_DOMAIN)));
         dbnToolsRespond(['ok' => true, 'hits' => $hits, 'mode' => 'vector', 'query' => $query]);
     }