add setup foundations: site gate, registration lockdown, coming soon page

- Settings.site_live?/0 and set_site_live/1 for shop visibility control
- Accounts.has_admin?/0 to detect single-tenant admin existence
- Registration lockdown: /users/register redirects when admin exists
- Setup.setup_status/0 aggregates provider, product, and stripe checks
- Coming soon page at /coming-soon with themed styling
- ThemeHook :require_site_live gate on all public shop routes
  - Site live → everyone through
  - Authenticated → admin preview through
  - No admin → fresh install demo through
  - Otherwise → redirect to coming soon
- Go live / take offline toggle on /admin/settings
- 648 tests, 0 failures

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

test/simpleshop_theme/accounts_test.exs

@@ -6,6 +6,22 @@ defmodule SimpleshopTheme.AccountsTest do
   import SimpleshopTheme.AccountsFixtures
   alias SimpleshopTheme.Accounts.{User, UserToken}
 
+  describe "has_admin?/0" do
+    test "returns false when no users exist" do
+      refute Accounts.has_admin?()
+    end
+
+    test "returns true when a user exists" do
+      user_fixture()
+      assert Accounts.has_admin?()
+    end
+
+    test "returns true with an unconfirmed user" do
+      unconfirmed_user_fixture()
+      assert Accounts.has_admin?()
+    end
+  end
+
   describe "get_user_by_email/1" do
     test "does not return the user if the email does not exist" do
       refute Accounts.get_user_by_email("unknown@example.com")

test/simpleshop_theme/settings_test.exs

@@ -192,6 +192,25 @@ defmodule SimpleshopTheme.SettingsTest do
     end
   end
 
+  describe "site_live?/0 and set_site_live/1" do
+    test "defaults to false when no setting exists" do
+      refute Settings.site_live?()
+    end
+
+    test "returns true after setting site live" do
+      assert {:ok, _} = Settings.set_site_live(true)
+      assert Settings.site_live?()
+    end
+
+    test "returns false after setting site offline" do
+      assert {:ok, _} = Settings.set_site_live(true)
+      assert Settings.site_live?()
+
+      assert {:ok, _} = Settings.set_site_live(false)
+      refute Settings.site_live?()
+    end
+  end
+
   describe "delete_setting/1" do
     test "deletes an existing setting" do
       {:ok, _} = Settings.put_setting("to_delete", "value")

test/simpleshop_theme/setup_test.exs

@@ -0,0 +1,94 @@
+defmodule SimpleshopTheme.SetupTest do
+  use SimpleshopTheme.DataCase, async: false
+
+  alias SimpleshopTheme.{Setup, Settings, Products}
+
+  import SimpleshopTheme.AccountsFixtures
+
+  describe "setup_status/0" do
+    test "returns all false on fresh install" do
+      status = Setup.setup_status()
+
+      refute status.admin_created
+      refute status.printify_connected
+      refute status.products_synced
+      assert status.product_count == 0
+      refute status.stripe_connected
+      refute status.site_live
+      refute status.can_go_live
+    end
+
+    test "detects admin created" do
+      user_fixture()
+      status = Setup.setup_status()
+
+      assert status.admin_created
+    end
+
+    test "detects stripe connected" do
+      {:ok, _} = Settings.put_secret("stripe_api_key", "sk_test_abc123")
+      status = Setup.setup_status()
+
+      assert status.stripe_connected
+    end
+
+    test "detects site live" do
+      {:ok, _} = Settings.set_site_live(true)
+      status = Setup.setup_status()
+
+      assert status.site_live
+    end
+
+    test "detects printify connected with products" do
+      {:ok, conn} =
+        Products.create_provider_connection(%{
+          name: "Test",
+          provider_type: "printify",
+          api_key: "test_api_key"
+        })
+
+      status = Setup.setup_status()
+      assert status.printify_connected
+      refute status.products_synced
+      assert status.product_count == 0
+
+      # Add a product
+      {:ok, _product} =
+        Products.create_product(%{
+          title: "Test product",
+          provider_product_id: "ext-1",
+          provider_connection_id: conn.id,
+          status: "active"
+        })
+
+      status = Setup.setup_status()
+      assert status.products_synced
+      assert status.product_count == 1
+    end
+
+    test "can_go_live requires printify, products, and stripe" do
+      {:ok, conn} =
+        Products.create_provider_connection(%{
+          name: "Test",
+          provider_type: "printify",
+          api_key: "test_api_key"
+        })
+
+      {:ok, _product} =
+        Products.create_product(%{
+          title: "Test product",
+          provider_product_id: "ext-1",
+          provider_connection_id: conn.id,
+          status: "active"
+        })
+
+      # Still missing stripe
+      refute Setup.setup_status().can_go_live
+
+      # Add stripe
+      {:ok, _} = Settings.put_secret("stripe_api_key", "sk_test_abc123")
+
+      assert Setup.setup_status().can_go_live
+    end
+  end
+end