fix(knowledge): query tags on json columns

apps/api/src/repositories/knowledge_repository.py

@@ -190,7 +190,7 @@ class KnowledgeDBRepository:
             count_query = count_query.where(KnowledgeEntryRecord.status == status)
         if tags:
             for tag in tags:
-                tag_filter = KnowledgeEntryRecord.tags.op('@>')(f'["{tag}"]')
+                tag_filter = _json_string_array_has_tag(tag)
                 query = query.where(tag_filter)
                 count_query = count_query.where(tag_filter)
         if q:
@@ -347,3 +347,18 @@ class KnowledgeDBRepository:
             created_at=record.created_at,
             updated_at=record.updated_at,
         )
+
+
+def _json_string_array_has_tag(tag: str):
+    """建立 JSON/JSONB 皆相容的 tag filter。
+
+    production 的 knowledge_entries.tags 目前是 JSON 欄位，不支援 json @> text。
+    這裡改用帶引號的字串比對，避免把 tag 片段誤判成完整 tag。
+    """
+    escaped = (
+        tag
+        .replace("\\", "\\\\")
+        .replace("%", "\\%")
+        .replace("_", "\\_")
+    )
+    return KnowledgeEntryRecord.tags.cast(String).ilike(f'%"{escaped}"%', escape="\\")