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.

.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.

.gitea/ISSUE_TEMPLATE/mvp_task.md

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+---
+name: MVP Task
+about: Task for the MVP (v0.1) release
+labels: mvp, enhancement
+---
+
+## Task Description
+Brief description of what needs to be done.
+
+## Acceptance Criteria
+- [ ] Criterion 1
+- [ ] Criterion 2
+- [ ] Criterion 3
+
+## Technical Details
+- **Related files/components:**
+- **Database changes:** (if any)
+- **Dependencies:** (other issues that must be completed first)
+
+## Resources
+- Link to relevant documentation
+- Design mockups (if applicable)
+- API references
+
+## Testing
+How should this be tested?
+
+## Estimated Effort
+(e.g., 1 day, 3 days, 1 week)
+
+## Notes
+Any additional context or considerations.