add openapi

public/openapi/read.yaml

@@ -96,6 +96,8 @@ paths:
     $ref: 'read/admin/settings/user.yaml'
   /api/admin/settings/post:
     $ref: 'read/admin/settings/post.yaml'
+  /api/admin/settings/advanced:
+    $ref: 'read/admin/settings/advanced.yaml'
   /api/admin/manage/categories:
     $ref: 'read/admin/manage/categories.yaml'
   "/api/admin/manage/categories/{category_id}":

public/openapi/read/admin/settings/advanced.yaml

@@ -0,0 +1,18 @@
+get:
+  tags:
+    - admin
+  summary: Get advanced settings
+  responses:
+    "200":
+      description: ""
+      content:
+        application/json:
+          schema:
+            allOf:
+              - type: object
+                properties:
+                  groupsExemptFromMaintenanceMode:
+                    type: array
+                    items:
+                      $ref: ../../../components/schemas/GroupObject.yaml#/GroupDataObject
+              - $ref: ../../../components/schemas/CommonProps.yaml#/CommonProps