### What?
In the create-first-user view, fields like `richText` were being marked
as `readOnly: true` because they had no permissions entry in the
permissions map.
### Why?
The view was passing an incomplete `docPermissions` object.
When a field had no entry in `docPermissions.fields`, `renderField`
received `permissions: undefined`, which was interpreted as denied
access.
This caused fields (notably `richText`) to default to read-only even
though the user should have full access when creating the first user.
### How?
- Updated the create-first-user view to always pass a complete
`docPermissions` object.
- Default all fields in the user collection to `{ create: true, read:
true, update: true }`.
- Ensures every field is explicitly granted full access during the
first-user flow.
- Keeps the `renderField` logic unchanged and aligned with Payload’s
permission model.
Fixes#13612
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5146fc865f