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>

lib/berrypod_web/plugs/verify_printful_webhook.ex

@@ -0,0 +1,67 @@
+defmodule BerrypodWeb.Plugs.VerifyPrintfulWebhook do
+  @moduledoc """
+  Verifies Printful webhook requests using a shared secret token.
+
+  Checks the `webhook_secret` stored in the Printful provider connection
+  config against the `X-PF-Webhook-Token` header (or `token` query param
+  as fallback). Can be upgraded to HMAC signature verification once the
+  exact Printful signing format is confirmed.
+
+  Expects raw body cached in conn.assigns[:raw_body] (via CacheRawBody).
+  """
+
+  import Plug.Conn
+  require Logger
+
+  alias Berrypod.Products
+
+  def init(opts), do: opts
+
+  def call(conn, _opts) do
+    with {:ok, token} <- get_token(conn),
+         {:ok, secret} <- get_webhook_secret(),
+         :ok <- verify_token(token, secret) do
+      conn
+    else
+      {:error, reason} ->
+        Logger.warning("Printful webhook verification failed: #{reason}")
+
+        conn
+        |> put_resp_content_type("application/json")
+        |> send_resp(401, Jason.encode!(%{error: "Invalid token"}))
+        |> halt()
+    end
+  end
+
+  defp get_token(conn) do
+    # Check header first, then query param
+    case get_req_header(conn, "x-pf-webhook-token") do
+      [token] when token != "" ->
+        {:ok, token}
+
+      _ ->
+        case conn.query_params["token"] || conn.params["token"] do
+          token when is_binary(token) and token != "" -> {:ok, token}
+          _ -> {:error, :missing_token}
+        end
+    end
+  end
+
+  defp get_webhook_secret do
+    case Products.get_provider_connection_by_type("printful") do
+      %{config: %{"webhook_secret" => secret}} when is_binary(secret) and secret != "" ->
+        {:ok, secret}
+
+      _ ->
+        {:error, :no_webhook_secret}
+    end
+  end
+
+  defp verify_token(token, secret) do
+    if Plug.Crypto.secure_compare(token, secret) do
+      :ok
+    else
+      {:error, :token_mismatch}
+    end
+  end
+end