Merge branch 'main' into wheatgrassmc/fixes

Author: tingkai-mai

backend/question/docs/question.plantuml

@@ -54,7 +54,7 @@ note right of IQuestionServiceAPI
   - POST /{id}/update: Update a specific question by ID
   - POST /{id}/delete: Delete a specific question by ID
   - POST /count-question: Count non-deleted questions given a list of complexities and categories
-  - POST /pick-question: Pick a random question given a list of complexities and categories
+  - POST /pick-question: Pick a random question given a complexity and category
 end note
 
 class QuestionService {