feat(config): add RECOMMENDED_QUESTIONS_ENABLED toggle

Add system-level configuration to enable/disable LLM-generated
recommended questions. When disabled, the API returns empty array
instead of calling LLM, affecting both quick questions and
post-message suggestions.

- Add RECOMMENDED_QUESTIONS_ENABLED in config.py (default: true)
- Add config check in ask_recommend_questions API endpoint

Author: WainWong

backend/apps/chat/api/chat.py

@@ -21,6 +21,7 @@
 from apps.swagger.i18n import PLACEHOLDER_PREFIX
 from apps.system.schemas.permission import SqlbotPermission, require_permissions
 from common.core.deps import CurrentAssistant, SessionDep, CurrentUser, Trans
+from common.core.config import settings
 from common.utils.command_utils import parse_quick_command
 from common.utils.data_format import DataFormat
 from common.audit.models.log_model import OperationType, OperationModules
@@ -198,6 +199,9 @@ async def ask_recommend_questions(session: SessionDep, current_user: CurrentUser
     def _return_empty():
         yield 'data:' + orjson.dumps({'content': '[]', 'type': 'recommended_question'}).decode() + '\n\n'
 
+    if not settings.RECOMMENDED_QUESTIONS_ENABLED:
+        return StreamingResponse(_return_empty(), media_type="text/event-stream")
+
     try:
         record = get_chat_record_by_id(session, chat_record_id)
 

backend/common/core/config.py

@@ -124,6 +124,9 @@ def SQLALCHEMY_DATABASE_URI(self) -> PostgresDsn | str:
     TABLE_EMBEDDING_COUNT: int = 10
     DS_EMBEDDING_COUNT: int = 10
 
+    # 推荐问题配置（LLM生成）
+    RECOMMENDED_QUESTIONS_ENABLED: bool = True
+
     ORACLE_CLIENT_PATH: str = '/opt/sqlbot/db_client/oracle_instant_client'
 
     @field_validator('SQL_DEBUG',
@@ -132,6 +135,7 @@ def SQLALCHEMY_DATABASE_URI(self) -> PostgresDsn | str:
                      'PARSE_REASONING_BLOCK_ENABLED',
                      'PG_POOL_PRE_PING',
                      'TABLE_EMBEDDING_ENABLED',
+                     'RECOMMENDED_QUESTIONS_ENABLED',
                      mode='before')
     @classmethod
     def lowercase_bool(cls, v: Any) -> Any: