Create twenty app improvements (#20688)

create-twenty-app updates:
- remove --example option
- sync --once when scaffolding an applicaiton
- rename --api-url option to --workspace-url
- create a standalone page when scaffolding an app
<img width="1494" height="765" alt="image"
src="https://github.com/user-attachments/assets/0e35ed0c-b0aa-466c-9f56-7939294fd2cf"
/>

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packages/twenty-sdk/src/cli/utilities/build/common/plugins/__tests__/__snapshots__/stub-twenty-sdk-define.plugin.spec.ts.snap

@@ -26,7 +26,6 @@ exports[`stub-twenty-sdk-define plugin > matches the recorded export partition 1
     "ViewType",
     "ViewVisibility",
     "generateDefaultFieldUniversalIdentifier",
-    "getPublicAssetUrl",
     "validateFields",
   ],
   "factories": [