Implement template conflict checks and file copying in cmd_init function

nut/__main__.py

@@ -1,4 +1,5 @@
 from .cli import CLI
+from .commands.setup import is_nut_workspace, find_template_conflicts, copy_template_files
 
 def help_text():
     return [
@@ -29,7 +30,20 @@ def main() -> int:
     return cli.run()
 
 def cmd_init(args, flags) -> int:
-    print("INIT", args, flags)
+    dest_dir = args[0]
+    force = flags["force"]
+
+    conflicts = find_template_conflicts(dest_dir)
+    if conflicts and not force:
+        print("Some files already exist that would be overwritten:")
+        for file in conflicts:
+            print(f"  {file}")
+
+        print("Use --force to overwrite existing files.")
+        return 1
+    
+    copy_template_files(dest_dir, force=force, checked=True)
+
     return 0
 
 if __name__ == "__main__":