docs: add OpenAPI-first wiki (overview, components, use cases for templates/client/codegen, design, security, error handling, testing) and refresh lib docs index

openapi_first/templates/model_app/__init__.py

@@ -28,15 +28,15 @@ Scaffolding via CLI
 
 Create a new model-based CRUD example service using the bundled template:
 
-    openapi-first model_app
+    openapi-first scaffold model_app
 
 Create the service in a custom directory:
 
-    openapi-first model_app my-model-service
+    openapi-first scaffold model_app my-model-service
 
 List all available application templates:
 
-    openapi-first --list
+    openapi-first scaffold --list
 
 The CLI copies template files verbatim into the target directory.
 No code is generated or modified beyond the copied scaffold.