Add StreamDeck Plus support for PTT/channel select/volume

[djshadowxm82]

Integrate Elgato StreamDeck Plus hardware into RadioConsole2.

Summary

Integrate Elgato StreamDeck Plus hardware into RadioConsole2 as a full hardware interface that:

• Could render each “radio card” (channel/preset) label and status on the LCD keys
• Lets operators tap buttons to select radio cards directly
• Provides dedicated PTT, channel up/down, scan/preset and mute controls
• Uses dials and touch strip for master & per‑channel volume/pan

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Motivation

• Present real‑time channel names, frequencies or statuses on each key for quick visual feedback
• Allow one‑tap selection of any radio card without hunting through the GUI
• Maintain low‑latency, tactile operation for various scenarios

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Feature Details

• Dynamic Button Labels
  • Query rc2-console for current radio‑card list (name, frequency, active/inactive state)
  • Push updated labels/icons to each StreamDeck key on screen changes
• Direct Selection
  • Map each key to selectCard(cardId)
  • Support paging or multiple pages if radio‑card count exceeds 8
• Dedicated Controls
  • PTT toggle, Channel Up/Down, Scan/Preset toggle, Mute/Unmute
• Audio Controls
  • Rotary dials for master and per‑card volume/gain
  • Touch strip for fine‑grained volume or pan
• Configuration UI
  • Auto‑detect StreamDeck Plus devices
  • Allow remapping of all controls and set paging behavior for radio‑card buttons
  • Persist mappings in config file