add setup onboarding page, dashboard launch checklist, provider registry

- new /setup page with three-section onboarding (account, provider, payments)
- dashboard launch checklist with progress bar, go-live, dismiss
- provider registry on Provider module (single source of truth for metadata)
- payments registry for Stripe
- setup context made provider-agnostic (provider_connected, theme_customised, etc.)
- admin provider pages now fully registry-driven (no hardcoded provider names)
- auth flow: fresh installs redirect to /setup, signed_in_path respects setup state
- removed old /admin/setup wizard
- 840 tests, 0 failures

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

test/berrypod/setup_test.exs

@@ -10,12 +10,17 @@ defmodule Berrypod.SetupTest do
       status = Setup.setup_status()
 
       refute status.admin_created
-      refute status.printify_connected
+      refute status.provider_connected
+      assert is_nil(status.provider_type)
       refute status.products_synced
       assert status.product_count == 0
       refute status.stripe_connected
+      refute status.setup_complete
       refute status.site_live
       refute status.can_go_live
+      refute status.theme_customised
+      refute status.has_orders
+      refute status.checklist_dismissed
     end
 
     test "detects admin created" do
@@ -39,7 +44,7 @@ defmodule Berrypod.SetupTest do
       assert status.site_live
     end
 
-    test "detects printify connected with products" do
+    test "detects provider connected with products" do
       {:ok, conn} =
         Products.create_provider_connection(%{
           name: "Test",
@@ -48,7 +53,8 @@ defmodule Berrypod.SetupTest do
         })
 
       status = Setup.setup_status()
-      assert status.printify_connected
+      assert status.provider_connected
+      assert status.provider_type == "printify"
       refute status.products_synced
       assert status.product_count == 0
 
@@ -66,7 +72,24 @@ defmodule Berrypod.SetupTest do
       assert status.product_count == 1
     end
 
-    test "can_go_live requires printify, products, and stripe" do
+    test "setup_complete requires admin, provider, and stripe" do
+      user_fixture()
+
+      {:ok, _conn} =
+        Products.create_provider_connection(%{
+          name: "Test",
+          provider_type: "printful",
+          api_key: "test_api_key"
+        })
+
+      refute Setup.setup_status().setup_complete
+
+      {:ok, _} = Settings.put_secret("stripe_api_key", "sk_test_abc123")
+
+      assert Setup.setup_status().setup_complete
+    end
+
+    test "can_go_live requires provider, products, and stripe" do
       {:ok, conn} =
         Products.create_provider_connection(%{
           name: "Test",
@@ -90,5 +113,13 @@ defmodule Berrypod.SetupTest do
 
       assert Setup.setup_status().can_go_live
     end
+
+    test "detects theme customised" do
+      refute Setup.setup_status().theme_customised
+
+      {:ok, _} = Settings.update_theme_settings(%{mood: "warm"})
+
+      assert Setup.setup_status().theme_customised
+    end
   end
 end