feat: initial implementation of Datacat

- Add project structure with UV/hatch build system
- Implement config module (env vars + YAML file support)
- Implement collector module for pylitterbot integration
- Implement metrics module for Datadog submission
- Support LR3, LR4, and Feeder Robot metrics
- Add event emission for state changes
- Add CLI with --once mode for single collection

.gitignore

@@ -0,0 +1,81 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# Config files with secrets
+config.yaml
+config.yml
+
+# UV
+.uv/
+uv.lock
+
+# macOS
+.DS_Store
+
+# Datacat specific
+*.log