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

.env.example

@@ -0,0 +1,20 @@
+# Datacat Environment Variables
+# Copy this file to .env and update with your credentials
+
+# Whisker/Litter Robot credentials
+WHISKER_USERNAME=your-email@example.com
+WHISKER_PASSWORD=your-password
+
+# Datadog credentials
+DATADOG_API_KEY=your-datadog-api-key
+DATADOG_APP_KEY=your-datadog-app-key
+DATADOG_SITE=datadoghq.com
+
+# Collector settings
+DATACAT_POLL_INTERVAL=120
+DATACAT_INCLUDE_PETS=true
+DATACAT_EMIT_EVENTS=true
+DATACAT_METRIC_PREFIX=litterrobot
+
+# Optional: Path to config file (if using YAML config instead of env vars)
+# DATACAT_CONFIG_FILE=/path/to/config.yaml