NethVoice Proxy: Implement GNR trunks configuration UI

[Amygos]

Proposed Feature

Implement a user interface for configuring GNR (registration-free) trunks in NethVoice Proxy, as outlined in issue #7139. This UI will allow administrators to manage trunk configurations that route calls based on dialed numbers without requiring registration.
The mockups of the IU can be found in issue #7411

Purpose and Motivation

Currently, there is no user interface for configuring GNR trunks in NethVoice Proxy. Administrators need a way to:

• Define trunk numbers using prefixes
• Specify which NethVoice system should handle forwarded calls
• Create routes based on dialed numbers without registration requirements

This feature is essential for proper trunk management and call routing in NethVoice Proxy deployments.

Proposed Solution

Implement a comprehensive UI that provides the following functionality:

1. List View: Display all configured trunks with their prefixes and associated NethVoice instances
2. Add Trunk: Interface to create new trunk configurations
3. Edit Trunk: Modify existing trunk settings
4. Delete Trunk: Remove trunk configurations

Technical Implementation Details:

• Use the following API actions:

  • list-trunks: Retrieve the list of configured trunks
  • add-trunk: Add or edit trunk configurations
  • delete-trunk: Remove trunk configurations

• Integrate with service discovery (as implemented in NethVoice: Allow the instances in the cluster to be discoverable #7456):

  • Filter results by local proxy node ID
  • Match trunk routes using the uri field from list-trunks JSON output
  • Correlate with NethVoice instances using node_address and port fields from list-service-providers action

UI Requirements:

Each trunk configuration should include:

1. A prefix for the trunk (number pattern)
2. A NethVoice module instance selection for call forwarding

The interface should support:

• Dropdown or selection mechanism for available NethVoice instances
• Validation of trunk configurations
• Clear display of existing trunk mappings

Additional Context

This UI implementation builds upon:

• Issue NethVoice Proxy: add GNR trunks configuration interface #7139: Original GNR trunks configuration requirement
• Issue NethVoice: Allow the instances in the cluster to be discoverable #7456: NethVoice instance service discovery functionality
• Issue Nethvoice Proxy: GNR trunk UI mockup #7411 : UI Mockups

[stephdl]

figma https://www.figma.com/design/OsYqPXdkKJz0tBJRsiQgAf/NethServer-shared-file?node-id=2359-26984

[stephdl]

mattermost conversation : https://mattermost.nethesis.it/nethesis/pl/do8st4573tnn9nye71kczd6eso