Update requirements and enhance mindmap UI: Comment out Pillow dependency, add network background script, and implement new styles and animations for improved visual effects in the mindmap template.

copy-network-image.bat

@@ -0,0 +1,33 @@
+@echo off
+echo Copying network image to website/static/network-bg.jpg...
+
+if not exist "website\static" (
+    echo Error: website/static directory does not exist.
+    echo Make sure you are running this script from the main project directory.
+    pause
+    exit /b 1
+)
+
+if "%~1"=="" (
+    echo Usage: copy-network-image.bat [path_to_image]
+    echo Example: copy-network-image.bat d2efd014-1325-471f-b9a7-90d025eb81d6.png
+    pause
+    exit /b 1
+)
+
+if not exist "%~1" (
+    echo Error: The specified image file "%~1" does not exist.
+    pause
+    exit /b 1
+)
+
+copy /Y "%~1" "website\static\network-bg.jpg" > nul
+
+if %errorlevel% equ 0 (
+    echo Success! The image has been copied to website/static/network-bg.jpg
+    echo Please restart the Flask server to see the changes.
+) else (
+    echo Error: Failed to copy the image.
+)
+
+pause