Add YouTube live stream monitoring workflow

[Copilot]

Implements a temporal workflow that monitors YouTube channels for new live streams and sends Slack notifications when channels go live.

Features

• Automated Monitoring: Runs every 2 minutes via Temporal scheduler
• YouTube API Integration: Polls YouTube Data API v3 to detect new live streams
• Smart Filtering: Only notifies for streams that started within the last 2 minutes
• Slack Notifications: Sends formatted messages to a configurable Slack channel
• Configurable Channels: Monitor any YouTube channels by channel ID
• Error Handling: Graceful handling of API failures and network issues

Implementation Details

New Components

• YouTubeLiveWorkflow - Main temporal workflow that orchestrates the monitoring
• check_youtube_live_streams_activity - Activity that queries YouTube API
• send_slack_notification_activity - Activity that sends Slack notifications
• Parameter classes for type-safe workflow configuration

Integration

• Added to existing temporal worker configuration
• Follows established patterns from SlackMessageQODWorkflow
• Uses existing Slack client infrastructure

Configuration

Requires YOUTUBE_API_KEY environment variable with YouTube Data API v3 credentials.

Default monitored channels (configurable):

channel_ids = [
    "UC_x5XG1OV2P6uZZ5FSM9Ttw",  # Google Developers
    "UCsooa4yRKGN_zEE8iknghZA",  # TED-Ed
    "UC8butISFwT-Wl7EV0hUK0BQ",  # Free Code Camp
]

Example Notification

🔴 *Google Developers* just went live!
📺 Building Modern Web Apps with Firebase
🔗 https://youtube.com/watch?v=abc123

Testing

Added comprehensive unit tests covering:

• Workflow parameter validation
• Activity parameter structures
• Schedule configuration (2-minute intervals)
• Data model instantiation

Documentation

• Complete setup guide in docs/youtube-live-monitor.md
• API quota usage estimates
• Environment configuration examples

Fixes #102.

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[QMasterMoo]

this should use the scheduled time on temporal. otherwise it would be possible for delays

[Copilot]

Fixed in commit a51da38. The activity now uses workflow.info().current_build_started_at as the scheduled time instead of datetime.now(). This ensures consistent monitoring windows even if there are execution delays, preventing missed streams or incorrect time calculations.