perf: fix N+1 query issues in user group access control validation

- Pre-fetch user group IDs in get_*_by_user_id methods across models layer
- Pass user_group_ids to has_access to avoid repeated group queries
- Reduce query count from 1+N to 1+1 pattern for access control validation
- Apply consistent optimization across knowledge, models, notes, prompts, and tools

Signed-off-by: Sihyeon Jang <sihyeon.jang@navercorp.com>

backend/open_webui/models/knowledge.py

@@ -8,6 +8,7 @@ from open_webui.internal.db import Base, get_db
 from open_webui.env import SRC_LOG_LEVELS
 
 from open_webui.models.files import FileMetadataResponse
+from open_webui.models.groups import Groups
 from open_webui.models.users import Users, UserResponse
 
 
@@ -147,11 +148,12 @@ class KnowledgeTable:
         self, user_id: str, permission: str = "write"
     ) -> list[KnowledgeUserModel]:
         knowledge_bases = self.get_knowledge_bases()
+        user_group_ids = {group.id for group in Groups.get_groups_by_member_id(user_id)}
         return [
             knowledge_base
             for knowledge_base in knowledge_bases
             if knowledge_base.user_id == user_id
-            or has_access(user_id, permission, knowledge_base.access_control)
+            or has_access(user_id, permission, knowledge_base.access_control, user_group_ids)
         ]
 
     def get_knowledge_by_id(self, id: str) -> Optional[KnowledgeModel]: