存档 GitHub 配置并清理未使用的文件

- 将所有 `.github` 目录的内容移动到 `.github.bak` 进行归档
   - 更新 `.gitignore` 文件，添加 IDE、系统和二进制文件的忽略规则
   - 删除未使用的 `Dockerfile` 和 `pop.exe` 二进制文件

.github.bak/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.