docs: issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## Describe the bug
+A clear and concise description of what the bug is.
+
+## To Reproduce
+Steps to reproduce the behavior:
+1. Run command '...'
+2. With environment variables '...'
+3. See error
+
+## Expected behavior
+A clear and concise description of what you expected to happen.
+
+## Actual behavior
+What actually happened instead.
+
+## Screenshots or Output
+If applicable, add screenshots or command output to help explain your problem.
+
+```bash
+# Paste command output here
+```
+
+## Environment
+- OS: [e.g. macOS 14.0, Ubuntu 22.04]
+- Node.js version: [e.g. 18.0.0]
+- envui version: [e.g. 1.0.0]
+- Shell: [e.g. bash, zsh]
+
+## Additional context
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+## Is your feature request related to a problem?
+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.
+
+## Use case
+Describe how this feature would be used and who would benefit from it.
+
+## Example
+If applicable, provide an example of how the feature would work:
+
+```bash
+# Example command or usage
+envui --new-feature
+```
+
+## Additional context
+Add any other context or screenshots about the feature request here.