Trunks - redesign admin UI

[AmaLuci]

Goal
Reorganize and simplify the management of PBX lines (physical and VoIP), improving clarity, consistency and ease of configuration.

This section includes:

• Physical trunk configuration
• VoIP trunks configuration
• Trunks list (overview, status, main info)
• Add / edit trunk flows
  -Trunk status (where applicable)

Design goals

• simplify trunk configuration and editing
• clearly distinguish between physical and VoIP trunks
• reduce configuration errors through clearer UI and structure
• ensure scalability for multiple trunks

Output
hi-fi mockups
main interaction flows (e.g. add/edit trunk)
states and edge cases where relevant