fix: 修复DB.py中的SQL查询以正确处理黑名单关键词逻辑

DB.py

@@ -440,10 +440,19 @@ WHERE a.white_status = 1;
             k.status = 1
             AND t.status = 1
             AND NOT EXISTS (
-                SELECT 1 FROM sh_dm_black_keyword b WHERE b.title = t.title
+                SELECT 1
+                FROM sh_dm_black_keyword b
+                WHERE
+                    (
+                        (b.keyword IS NULL OR b.keyword = '') AND b.title = t.title
+                    )
+                    OR (
+                        b.keyword IS NOT NULL AND b.keyword != '' AND b.keyword = k.keyword
+                    )
             )
             AND t.level = %s
-        GROUP BY k.keyword, k.rn
+        GROUP BY
+            k.keyword, k.rn;
         """
         self.cursor.execute(sql, (level,))
         return self.cursor.fetchall()