[FEATURE] Create "Lite" Version of Codec for Navigator-only scenarios

[Copilot]

This PR implements a lightweight Cisco codec implementation specifically designed for Navigator-only scenarios, addressing the need for a more efficient solution when full codec features are not required.

Problem

The current CiscoCodec implementation extends VideoCodecBase and implements 20+ interfaces, providing comprehensive video conferencing functionality. However, for Navigator-only scenarios, this creates unnecessary overhead:

• Large memory footprint from unused features
• Slow initialization due to phonebook/booking/status polling
• Complex communication queuing for features that aren't needed
• Resource waste in room combination scenarios

Solution

This implementation introduces a clean interface-based approach that allows both full and lite codec implementations to coexist:

New Components

ICiscoCodecBase Interface

public interface ICiscoCodecBase : IKeyed
{
    void EnqueueCommand(string command);
    UiExtensions UiExtensions { get; set; }
    ExtensionsHandler UiExtensionsHandler { get; set; }
    event EventHandler<EventArgs> IsReadyChange;
    bool IsReady { get; }
}

CiscoCodecNavigatorLite Class

• Inherits from EssentialsDevice for proper framework integration
• Implements only essential functionality needed for Navigator scenarios
• Provides direct communication without complex queuing overhead
• Supports UI Extensions and basic connectivity monitoring

Factory Integration

{
  "type": "ciscoRoomOSNavigatorLite",
  "properties": {
    "control": {
      "method": "ssh",
      "tcpSshProperties": {
        "address": "10.1.1.100",
        "port": 22,
        "username": "admin"
      }
    }
  }
}

Key Benefits

🚀 Performance: Reduced memory footprint and faster initialization for Navigator-only scenarios

🔧 Compatibility: Existing CiscoCodec now implements ICiscoCodecBase ensuring zero breaking changes

⚡ Efficiency: Direct command sending eliminates unnecessary queuing overhead

🎯 Purpose-built: Optimized specifically for Navigator WebView control and mobile integration

What's Supported

✅ Navigator WebView control
✅ Mobile Control integration
✅ UI Extensions support
✅ Basic connectivity monitoring
✅ NavigatorLockoutHandler compatibility

What's Not Included

❌ Call management features
❌ Camera control (SpeakerTrack, PresenterTrack)
❌ Directory/phonebook integration
❌ Booking/scheduling features
❌ Advanced codec status monitoring

Migration Path

Existing installations can easily adopt the lite implementation by changing the device type from "ciscoRoomOS" to "ciscoRoomOSNavigatorLite" in their configuration. The interface-based design ensures that NavigatorController and related components work seamlessly with both implementations.

Testing

• ✅ Build verification passes with no breaking changes
• ✅ Interface compatibility confirmed across all components
• ✅ Factory correctly selects implementation based on device type
• ✅ Backward compatibility maintained for existing installations

Fixes #66.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• crl.entrust.net
  • Triggering command: dotnet build --verbosity minimal (dns block)
• ocsp.entrust.net
  • Triggering command: dotnet build --verbosity minimal (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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