Merge remote-tracking branch 'origin/master'

heheng

2025-07-09 c6901af945ffbabafb4d50f39d2beb3b6a4af677

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ALTER TABLE `train_exam`.`ex_student_answer`
MODIFY COLUMN `answer` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL COMMENT '答案';
 
ALTER TABLE `train_exam`.`ex_exercise_answer`
MODIFY COLUMN `answer` text CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci  NULL COMMENT '答案';