OpenAPI docs: identityname should be identity.name, and token scope admin should be global #2707

The generated OpenAPI document has two errors that make API calls fail or behave unexpectedly:

1. The event submit GET endpoints document an identityname query parameter. The server reads identity.name.
2. The token create endpoints say valid scopes are client, user, admin. The scope is actually named global, and admin is rejected.

Where

• identityname descriptions: EventEndpoints.cs#L610, #L650, #L682, #L715, #L923
• Server parsing: EventHandler.cs#L504-L509
• Scope descriptions: TokenEndpoints.cs#L101, #L122, #L146
• Actual scope names: AuthorizationRoles.cs#L10, #L24; validation in TokenHandler.cs#L222-L244
• Checked-in snapshot: openapi.json#L735, #L906, #L2179, #L2324, #L2633

What happens

• GET /api/v2/events/submit?...&identity=jane@example.com&identityname=Jane stores identityname as a custom data property, and the user's name isn't set.
• Creating a token with "scopes": ["admin"] returns a validation error, "Invalid token scope requested."

Expected

The parameter is documented as identity.name, and the scope descriptions list client, user, global (global admins only), and source-maps:write.

Suggested fix

Rename the parameter key and description in EventEndpoints.cs, fix the three token descriptions, and regenerate openapi.json. Optionally accept identityname as an alias in EventHandler for clients that followed the docs.