feat: enhance setup process in Makefile to include Dart installation

Author: ryan-gang

Makefile

@@ -161,6 +161,14 @@ setup:
 	# Clone repositories
 	git clone https://github.com/munificent/craftinginterpreters.git || true
 
+	# Install Dart
+	sudo apt-get update && sudo apt-get install apt-transport-https
+	wget -qO- https://dl-ssl.google.com/linux/linux_signing_key.pub \
+	  | sudo gpg  --dearmor -o /usr/share/keyrings/dart.gpg
+	echo 'deb [signed-by=/usr/share/keyrings/dart.gpg arch=amd64] https://storage.googleapis.com/download.dartlang.org/linux/debian stable main' \
+	  | sudo tee /etc/apt/sources.list.d/dart_stable.list
+	sudo apt-get update && sudo apt-get install dart=2.19.6-1
+
 	# Get Dart dependencies
 	cd craftinginterpreters && make get
 
@@ -178,7 +186,4 @@ setup:
 	cp -r interpreter-tester/internal/test_helpers/jlox08/* craftinginterpreters/build/gen/chap10_functions || true
 	cp -r interpreter-tester/internal/test_helpers/jlox08/* craftinginterpreters/build/gen/chap13_inheritance || true
 
-	# Cleanup
-	rm -rf interpreter-tester
-	
 	echo "Setup complete!"