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/feature_request.md

@@ -0,0 +1,24 @@
+---
+name: Feature Request
+about: Suggest a new feature or enhancement
+labels: enhancement
+---
+
+## Problem
+A clear description of the problem this feature would solve.
+(e.g., "I'm always frustrated when...")
+
+## Proposed Solution
+Describe the solution you'd like to see.
+
+## Alternatives Considered
+Describe any alternative solutions or features you've considered.
+
+## Use Case
+How would you use this feature? Who else would benefit?
+
+## Additional Context
+Add any other context, mockups, or screenshots about the feature request.
+
+## Implementation Ideas
+(Optional) Any technical suggestions for how this could be implemented.