feat(admin-auth): add first-start onboarding flow and dev db reset command

apps/admin/src/app/login/page.tsx

@@ -1,18 +1,36 @@
 import { redirect } from "next/navigation"
 
 import { resolveRoleFromServerContext } from "@/lib/access-server"
-import { isAdminRegistrationEnabled } from "@/lib/auth/server"
+import { hasOwnerUser } from "@/lib/auth/server"
 
 import { LoginForm } from "./login-form"
 
 export const dynamic = "force-dynamic"
 
-export default async function LoginPage() {
+type SearchParams = Promise<Record<string, string | string[] | undefined>>
+
+function getSingleValue(input: string | string[] | undefined): string | undefined {
+  if (Array.isArray(input)) {
+    return input[0]
+  }
+
+  return input
+}
+
+export default async function LoginPage({ searchParams }: { searchParams: SearchParams }) {
+  const params = await searchParams
+  const nextPath = getSingleValue(params.next) ?? "/"
   const role = await resolveRoleFromServerContext()
 
   if (role) {
     redirect("/")
   }
 
-  return <LoginForm allowRegistration={isAdminRegistrationEnabled()} />
+  const hasOwner = await hasOwnerUser()
+
+  if (!hasOwner) {
+    redirect(`/welcome?next=${encodeURIComponent(nextPath)}`)
+  }
+
+  return <LoginForm mode="signin" />
 }