added version and wrapper templates for portainer

_build/portainer_template_build.py

@@ -139,7 +139,13 @@ def main():
 
         templates.append(generate_template_object(item))
 
-    OUTPUT_FILE.write_text(json.dumps(templates, indent=2))
+    # Wrap in Portainer top-level object
+    output_data = {
+        "version": "3",
+        "templates": templates
+    }
+
+    OUTPUT_FILE.write_text(json.dumps(output_data, indent=2))
     print(f"Generated {OUTPUT_FILE} with templates for Docker Compose stacks.")
 
 if __name__ == "__main__":

templates.json

@@ -1,4 +1,6 @@
-[
+{
+  "version": "3",
+  "templates": [
     {
       "type": 1,
       "title": "phpcontainer",
@@ -3294,4 +3296,5 @@
       },
       "env": []
     }
-]
+  ]
+}