Add comprehensive development environment setup script

Author: Jenner Torrence

setup_dev_env.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+
+set -e
+
+echo "=== Flutter Structurizr Development Environment Setup ==="
+
+# 1. Check for Flutter installation
+if ! command -v flutter &> /dev/null; then
+  echo "Flutter is not installed. Please install Flutter SDK 3.10.0+ and ensure it's in your PATH."
+  exit 1
+fi
+
+# 2. Check for Dart installation (should be included with Flutter)
+if ! command -v dart &> /dev/null; then
+  echo "Dart is not installed. Please install Dart SDK (comes with Flutter) and ensure it's in your PATH."
+  exit 1
+fi
+
+# 3. Install Flutter dependencies
+echo "Running flutter pub get..."
+flutter pub get
+
+# 4. Install dependencies for demo_app, example, and test_app if present
+for dir in demo_app example test_app; do
+  if [ -d "$dir" ]; then
+    echo "Running flutter pub get in $dir/..."
+    (cd "$dir" && flutter pub get)
+  fi
+done
+
+# 5. Install any additional tools (e.g., lcov for coverage reports)
+if ! command -v lcov &> /dev/null; then
+  echo "lcov not found. Installing lcov (for coverage reports)..."
+  if [[ "$OSTYPE" == "linux-gnu"* ]]; then
+    sudo apt-get update && sudo apt-get install -y lcov
+  elif [[ "$OSTYPE" == "darwin"* ]]; then
+    brew install lcov
+  else
+    echo "Please install lcov manually for your OS."
+  fi
+fi
+
+# 6. Run code generation (build_runner)
+echo "Running code generation (build_runner)..."
+flutter pub run build_runner build --delete-conflicting-outputs
+
+# 7. (Optional) Run analyzer and tests to verify setup
+echo "Running flutter analyze..."
+flutter analyze
+
+echo "Running flutter test (smoke test)..."
+flutter test
+
+echo "=== Setup complete! ==="
+echo "You can now start developing or running the application."