Add unified per-speaker font support and remote transcription service

Font changes:
- Consolidate font settings into single Display Settings section
- Support Web-Safe, Google Fonts, and Custom File uploads for both displays
- Fix Google Fonts URL encoding (use + instead of %2B for spaces)
- Fix per-speaker font inline style quote escaping in Node.js display
- Add font debug logging to help diagnose font issues
- Update web server to sync all font settings on settings change
- Remove deprecated PHP server documentation files

New features:
- Add remote transcription service for GPU offloading
- Add instance lock to prevent multiple app instances
- Add version tracking

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CLAUDE.md

@@ -174,8 +174,9 @@ See [server/nodejs/README.md](server/nodejs/README.md) for deployment instructio
 
 - [client/server_sync.py](client/server_sync.py) handles server communication
 - Toggle in Settings: "Enable Server Sync"
-- Sends transcriptions to PHP server via POST
-- Separate web display shows merged transcriptions from all users
+- Sends transcriptions to Node.js server via HTTP POST
+- Real-time updates via WebSocket to display page
+- Per-speaker font support (Web-Safe, Google Fonts, Custom uploads)
 - Falls back gracefully if server unavailable
 
 ## Common Patterns
@@ -191,8 +192,8 @@ See [server/nodejs/README.md](server/nodejs/README.md) for deployment instructio
 ### Modifying Transcription Display
 
 - Local GUI: [gui/transcription_display_qt.py](gui/transcription_display_qt.py)
-- Web display (OBS): [server/web_display.py](server/web_display.py) (HTML in `_get_html()`)
-- Multi-user display: [server/php/display.php](server/php/display.php)
+- Local web display (OBS): [server/web_display.py](server/web_display.py) (HTML in `_get_html()`)
+- Multi-user display: [server/nodejs/server.js](server/nodejs/server.js) (display page in `/display` route)
 
 ### Adding a New Model Size