fix: 修复个人信息显示和优化日历样式

- 修复getLoginStudentInfo返回完整学生信息
- 优化日历事件项样式，添加渐变背景和阴影效果
- 美化日历单元格样式，添加圆角和悬停效果
- 修复当日单元格的视觉效果

单元背景.csv

@@ -0,0 +1,13 @@
+单元名称,单元海报_url
+岗位体系认知,https://ddcz-1315997005.cos.ap-nanjing.myqcloud.com/static/img/butler_course_cover/compression/recuSHuSaJkjjd.png
+产业认知课,https://ddcz-1315997005.cos.ap-nanjing.myqcloud.com/static/img/butler_course_cover/compression/recuSHuSaJakCU.png
+旅游产业全景与文旅基础知识,https://ddcz-1315997005.cos.ap-nanjing.myqcloud.com/static/img/butler_course_cover/compression/recuSHuSaJsPKb.png
+文旅服务：形象、沟通与体验的融合艺术,https://ddcz-1315997005.cos.ap-nanjing.myqcloud.com/static/img/butler_course_cover/compression/recuSHuSaJ4LRL.png
+文旅与供应链基础,https://ddcz-1315997005.cos.ap-nanjing.myqcloud.com/static/img/butler_course_cover/compression/recuSHuSaJOl8F.png
+商业设计基础,https://ddcz-1315997005.cos.ap-nanjing.myqcloud.com/static/img/butler_course_cover/compression/recuSHuSaJx0iL.png
+AIGC人工智能生成内容,https://ddcz-1315997005.cos.ap-nanjing.myqcloud.com/static/img/butler_course_cover/compression/recuSHuSaJyThB.png
+ 全栈新媒体运营赋能文旅营销,https://ddcz-1315997005.cos.ap-nanjing.myqcloud.com/static/img/butler_course_cover/compression/recuSHuSaJpmik.png
+活动策划基础,https://ddcz-1315997005.cos.ap-nanjing.myqcloud.com/static/img/butler_course_cover/compression/recuSHuSaJMV4g.png
+智慧文旅应用,https://ddcz-1315997005.cos.ap-nanjing.myqcloud.com/static/img/butler_course_cover/compression/recuSHuSaJWckP.png
+必备营销技能,https://ddcz-1315997005.cos.ap-nanjing.myqcloud.com/static/img/butler_course_cover/compression/recuSHuSaJnhOv.png
+自我营销课,https://ddcz-1315997005.cos.ap-nanjing.myqcloud.com/static/img/butler_course_cover/compression/recuSHuSaJ0GMw.png