fix: save_tags.dspy uuid→getID(16)，DSPY禁止import，改用预置getID

wwwroot/knowledge_bases_list/save_tags.dspy

@@ -1,5 +1,3 @@
-import uuid
-
 ns = params_kw.copy()
 kb_id = ns.get('kb_id', '')
 doc_id = ns.get('media_id', '')
@@ -33,7 +31,7 @@ else:
                     removed += 1
             for tid in wanted_ids:
                 if tid not in current:
-                    mt_id = uuid.uuid4().hex[:16]
+                    mt_id = getID(16)
                     await sor.sqlExe(
                         "INSERT INTO media_tags (id, kb_id, media_type, media_id, tag_id, created_at) "
                         "VALUES (${id}$, ${kb_id}$, 'document', ${mid}$, ${tid}$, NOW())",