feature: add system setting service (#12408)

### What problem does this PR solve?

#12409 

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Signed-off-by: Jin Hai <haijin.chn@gmail.com>

admin/server/services.py

@@ -24,6 +24,7 @@ from api.db.joint_services.user_account_service import create_new_user, delete_u
 from api.db.services.canvas_service import UserCanvasService
 from api.db.services.user_service import TenantService
 from api.db.services.knowledgebase_service import KnowledgebaseService
+from api.db.services.system_settings_service import SystemSettingsService
 from api.utils.crypt import decrypt
 from api.utils import health_utils
 
@@ -263,3 +264,47 @@ class ServiceMgr:
     @staticmethod
     def restart_service(service_id: int):
         raise AdminException("restart_service: not implemented")
+
+class SettingsMgr:
+    @staticmethod
+    def get_all():
+
+        settings = SystemSettingsService.get_all()
+        result = []
+        for setting in settings:
+            result.append({
+                'name': setting.name,
+                'setting_type': setting.setting_type,
+                'data_type': setting.data_type,
+                'value': setting.value,
+            })
+        return result
+
+    @staticmethod
+    def get_by_name(name: str):
+        settings = SystemSettingsService.get_by_name(name)
+        if len(settings) == 0:
+            raise AdminException(f"Can't get setting: {name}")
+        result = []
+        for setting in settings:
+            result.append({
+                'name': setting.name,
+                'setting_type': setting.setting_type,
+                'data_type': setting.data_type,
+                'value': setting.value,
+            })
+        return result
+
+    @staticmethod
+    def update_by_name(name: str, value: str):
+        settings = SystemSettingsService.get_by_name(name)
+        if len(settings) == 1:
+            setting = settings[0]
+            setting.value = value
+            setting_dict = setting.to_dict()
+            SystemSettingsService.update_by_name(name, setting_dict)
+        elif len(settings) > 1:
+            raise AdminException(f"Can't update more than 1 setting: {name}")
+        else:
+            raise AdminException(f"No sett"
+                                 f"ing: {name}")