为了方便学习,排除编译中间产物.o等的影响,增加.gitignore 的修改等#20

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nsynet wants to merge 3 commits intofigozhang:rlk_5.0from

Commits on Aug 23, 2025

add workspace file for vscode,add .gitignore and 'V=1' to display build detail
nsynet
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Commits on Aug 25, 2025

.gitignore 去掉不用的路径，字符设备自动生成文件节点，避免手工 mknod 创建文件节点
 nsynet
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Commits on Aug 26, 2025

文件节点属性为666；demodrv_write() 不能return 0，否则一直重试，导致写文件不退出；
nsynet
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