feat: add environment variable support to CLI and backend metadata

- Update CLI to use configurable app name and version from settings
- Make backend package metadata configurable via environment variables
- Add CONTACT_EMAIL environment variable support
- Ensure consistent branding across CLI, API, and web interface

backend/cli/__init__.py

@@ -18,15 +18,16 @@ if _backend_path not in sys.path:
     sys.path.insert(0, _backend_path)
 
 # Import our modules after path setup
+from app.core.config import settings  # noqa: E402
 from app.core.templates import template_registry  # noqa: E402
 from app.core.unit_file import SystemdUnitFile, UnitType, create_unit_file  # noqa: E402
 
 
 @click.group()
-@click.version_option(version="1.0.0")
+@click.version_option(version=settings.app_version)
 def cli():
-    """
-    UnitForge - Create, validate, and manage systemd unit files.
+    f"""
+    {settings.app_name} - Create, validate, and manage systemd unit files.
 
     A comprehensive tool for working with systemd unit files from the command line.
     """