feat: add role selection to user creation and UI updates

shop/lib/actions/users.ts

@@ -7,10 +7,25 @@ export async function getUsers() {
   const admin = createAdminClient()
   const { data: { users }, error } = await admin.auth.admin.listUsers()
   if (error) throw error
-  return users
+
+  const { data: dbUsers, error: dbError } = await admin
+    .from('users')
+    .select('id, role')
+  
+  const roleMap: Record<string, string> = {}
+  if (!dbError && dbUsers) {
+    dbUsers.forEach(u => {
+      roleMap[u.id] = u.role
+    })
+  }
+
+  return users.map(u => ({
+    ...u,
+    role: roleMap[u.id] || 'partner'
+  }))
 }
 
-export async function createUser(data: { email: string; password?: string; email_confirm?: boolean }) {
+export async function createUser(data: { email: string; password?: string; role?: 'admin' | 'partner'; email_confirm?: boolean }) {
   const admin = createAdminClient()
   const { data: { user }, error } = await admin.auth.admin.createUser({
     email: data.email,
@@ -18,6 +33,16 @@ export async function createUser(data: { email: string; password?: string; email
     email_confirm: data.email_confirm ?? true,
   })
   if (error) throw error
+  if (!user) throw new Error('Benutzer konnte nicht erstellt werden.')
+
+  // Upsert user role in public.users table
+  const role = data.role || 'partner'
+  const { error: dbError } = await admin
+    .from('users')
+    .upsert({ id: user.id, role }, { onConflict: 'id' })
+  
+  if (dbError) throw dbError
+
   revalidatePath('/admin/users')
   return user
 }