v1.0 🎉 add set_app_daily_limit service for per-app time limits

✨ New Features

• Per-app daily time limits - New set_app_daily_limit service (#59)

  • Set daily time limits for specific apps (e.g., 60 minutes for TikTok)
  • Use minutes: 0 to remove the limit and restore unlimited access
  • Supports targeting specific children via entity_id or child_id
  • When no child specified, applies to ALL supervised children

• Multi-child support for app control services (#57)

  • block_app and unblock_app now apply to ALL children when no child_id specified
  • Added optional entity_id parameter for easier child selection via UI
  • Added optional child_id parameter for direct targeting

• New API method: async_get_all_supervised_children() to retrieve all supervised children

• New API method: async_set_app_daily_limit() for per-app time limit control

🐛 Bug Fixes

• App control services (block_app, unblock_app) now default to applying to all children instead of just the first one
• Improved service descriptions to clarify multi-child behavior