feat: add CreatePoint mutation

Author: pan93412

docs/scope.md

@@ -11,6 +11,7 @@
 - `question`：題庫操作
   - `answer`：解答（只有 `read` 動作，`answer:write` 被 `question:write` 涵蓋）
 - `submission`：提交紀錄操作（做題）
+- `point`：點數操作（只有 `write` 操作）
 
 ## 動作
 

graph/user.graphqls

@@ -105,4 +105,9 @@ extend type Mutation {
   Logout from all the devices of the current user.
   """
   logoutAll: Boolean! @scope(scope: "me:write")
+
+  """
+  Create a new point record for a user.
+  """
+  createPoint(input: CreatePointInput!): Point @scope(scope: "point:write")
 }