Frappe Install App Command

Install a Frappe application to a specific site:

1. Verify bench directory: Confirm we're in a Frappe bench directory
2. List available apps: Show apps that are available in the bench but may not be installed on the site
3. List available sites: Display all sites in the bench
4. Get installation details:
   • App name to install
   • Site name where the app should be installed
5. Pre-installation checks:
   • Verify the app exists in the bench
   • Verify the site exists
   • Check if the app is already installed (warn user)
6. Install the app: Run bench --site <site-name> install-app <app-name>
7. Verify installation:
   • Check that the app appears in the site's installed apps
   • Look for any error messages
8. Post-installation:
   • Suggest running migrations if needed
   • Recommend restarting bench
   • Provide next steps for using the app

Error handling: Provide clear error messages if installation fails, including common issues like missing dependencies or database connection problems.