Enhance display customization and remove PHP server

Major improvements to display configuration and server architecture:

**Display Enhancements:**
- Add URL parameters for display customization (timestamps, maxlines, fontsize, fontfamily)
- Fix max lines enforcement to prevent scroll bars in OBS
- Apply font family and size settings to both local and sync displays
- Remove auto-scroll, enforce overflow:hidden for clean OBS integration

**Node.js Server:**
- Add timestamps toggle: timestamps=true/false
- Add max lines limit: maxlines=50
- Add font configuration: fontsize=16, fontfamily=Arial
- Update index page with URL parameters documentation
- Improve display URLs in room generation

**Local Web Server:**
- Add max_lines, font_family, font_size configuration
- Respect settings from GUI configuration
- Apply changes immediately without restart

**Architecture:**
- Remove PHP server implementation (Node.js recommended)
- Update all documentation to reference Node.js server
- Update default config URLs to Node.js endpoints
- Clean up 1700+ lines of PHP code

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

config/default_config.yaml

@@ -25,7 +25,7 @@ processing:
 
 server_sync:
   enabled: false
-  url: "http://localhost/transcription/server.php"
+  url: "http://localhost:3000/api/send"
   room: "default"
   passphrase: ""