chore(gitignore): 添加问题反馈视频目录到忽略列表

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Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

.gitignore

@@ -64,3 +64,8 @@ mini/tests/__snapshots__/*
 
 .playwright-mcp
 .dev-container-config.json
+
+# 问题封面视频
+web/public/问题封面/
+# 问题反馈视频
+web/public/问题反馈/