feat: Full-screen scaling system with three display modes

- Implemented comprehensive image/video scaling system
- Added fit, fill, and stretch scaling modes
- Keyboard shortcuts 1,2,3 for real-time mode switching
- Enhanced PIL/Pillow integration for image processing
- OpenCV video playback with full-screen scaling
- Settings integration for scaling preferences
- Fixed touch feedback for control buttons
- Thread-safe video frame processing
- Perfect aspect ratio calculations for any resolution

tkinter_app/resources/app_config.txt

@@ -1,9 +1,9 @@
 {
     "screen_orientation": "Landscape",
-    "screen_name": "tv-holba1",
+    "screen_name": "tv-terasa",
     "quickconnect_key": "8887779",
-    "server_ip": "192.168.1.245",
-    "port": "5000",
+    "server_ip": "digi-signage.moto-adv.com",
+    "port": "8880",
     "screen_w": "1920",
     "screen_h": "1080",
     "playlist_version": 5