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

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Planning
+- Complete project documentation suite
+- 6-week MVP roadmap defined
+- Tech stack decisions locked in
+
+---
+
+## [0.1.0] - TBD
+
+**MVP Release** - First usable version
+
+### Added
+- PWA with offline support
+- Barcode scanning via camera
+- Open Food Facts integration
+- Tag-based inventory organization
+- Unit conversion system (metric defaults)
+- Multi-user authentication (email/password)
+- Basic CRUD for inventory items
+- Search and filter functionality
+
+### Infrastructure
+- Nuxt 4 frontend
+- Supabase backend (self-hosted)
+- Docker Compose deployment
+- Coolify deployment guide
+
+---
+
+## [0.0.1] - 2026-02-08
+
+### Added
+- Initial project structure
+- Comprehensive documentation:
+  - README with project overview
+  - PROJECT_PLAN with 6-week roadmap
+  - ARCHITECTURE with system design
+  - DATABASE schema and RLS policies
+  - API reference for Supabase + Edge Functions
+  - DEVELOPMENT setup and workflow guide
+  - DEPLOYMENT guide for Docker + Coolify
+- MIT License
+- Organization and repository on Gitea
+
+---
+
+## Template for Future Releases
+
+```markdown
+## [X.Y.Z] - YYYY-MM-DD
+
+### Added
+- New features
+
+### Changed
+- Changes in existing functionality
+
+### Deprecated
+- Soon-to-be removed features
+
+### Removed
+- Removed features
+
+### Fixed
+- Bug fixes
+
+### Security
+- Security improvements
+```
+
+---
+
+[Unreleased]: https://gitea.jeanlucmakiola.de/pantry-app/pantry/compare/v0.0.1...HEAD
+[0.1.0]: https://gitea.jeanlucmakiola.de/pantry-app/pantry/releases/tag/v0.1.0
+[0.0.1]: https://gitea.jeanlucmakiola.de/pantry-app/pantry/releases/tag/v0.0.1