rename project from SimpleshopTheme to Berrypod

All modules, configs, paths, and references updated.
836 tests pass, zero warnings.

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

test/berrypod_web/controllers/error_json_test.exs

@@ -0,0 +1,14 @@
+defmodule BerrypodWeb.ErrorJSONTest do
+  use BerrypodWeb.ConnCase, async: true
+
+  test "renders 404" do
+    assert BerrypodWeb.ErrorJSON.render("404.json", %{}) == %{
+             errors: %{detail: "Not Found"}
+           }
+  end
+
+  test "renders 500" do
+    assert BerrypodWeb.ErrorJSON.render("500.json", %{}) ==
+             %{errors: %{detail: "Internal Server Error"}}
+  end
+end