chore: Add changelog and issue templates

- CHANGELOG.md: Keep a Changelog format, semantic versioning
- Issue templates: bug report, feature request, MVP task
- Ready for issue tracking on Gitea

.gitea/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,35 @@
+---
+name: Bug Report
+about: Report a bug or unexpected behavior
+labels: bug
+---
+
+## Description
+A clear description of the bug.
+
+## Steps to Reproduce
+1. Go to '...'
+2. Click on '...'
+3. Scroll down to '...'
+4. See error
+
+## Expected Behavior
+What you expected to happen.
+
+## Actual Behavior
+What actually happened.
+
+## Screenshots
+If applicable, add screenshots to help explain the problem.
+
+## Environment
+- **Device:** (e.g., iPhone 14, Desktop)
+- **OS:** (e.g., iOS 17, Ubuntu 24.04)
+- **Browser:** (e.g., Safari 17, Chrome 120)
+- **Pantry Version:** (e.g., v0.1.0)
+
+## Additional Context
+Any other relevant information.
+
+## Possible Solution
+(Optional) Suggest a fix or reason for the bug.