Add unit tests for AirQualityService (16 cases) and TelegramNotificationService (5 cases) using MockRestServiceServer. Remove unused color fields from Co2Level enum. Add .env to .gitignore. Assisted-by: Claude:claude-sonnet-4-6
- MessageCard webhook payload (Office 365 Connector format) - Periodic polling of /sensors/latest with configurable interval - CO₂ level thresholds aligned with UI config - Alert threshold configurable via alert-from-level property - TEAMS_WEBHOOK_URL and AIR_QUALITY_API_URL via env vars Closes #19
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