docs: update documentation and add Docker configuration for v0.3.0

- Update README.md with v0.3.0 completion status and improved setup instructions
- Update export/progress.md with completed tasks (53/55, 96% progress)
- Update export/architecture.md with current project structure and implementation status
- Add docker-compose.yml with PostgreSQL service
- Add Dockerfile.backend for production builds
- Add frontend/Dockerfile for multi-stage builds
- Update .gitignore with comprehensive rules for Python, Node.js, and Docker

Project status:
- v0.2.0: Database and Backend API ✅
- v0.3.0: Frontend React implementation ✅
- v0.4.0: Reports and visualization (planned)

.gitignore

@@ -1,2 +1,61 @@
 venv/
 .venv/
+
+# Docker
+.dockerignore
+docker-compose.override.yml
+
+# Database
+postgres_data/
+*.db
+
+# Environment
+.env
+.env.local
+.env.*.local
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/
+.tox/
+.nox/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# Logs
+*.log
+logs/
+
+# Frontend
+frontend/node_modules/
+frontend/dist/
+frontend/.vite/