fix: remove unmigrated fields from provision endpoint

Skip visibility/isPublic and ownerDid - the Prisma schema has columns
that don't exist in the production DB yet. Let DB defaults handle it.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/api/internal/provision/route.ts

@@ -33,7 +33,6 @@ export async function POST(request: Request) {
       name: space.charAt(0).toUpperCase() + space.slice(1),
       slug: space,
       description: body.description || `${space} governance space`,
-      isPublic: body.public ?? false,
       members: {
         create: {
           userId: user.id,