Add shared customer auth, cart handoff, and account dropdown.

Mirror Meshkee customer sessions onto the storefront, continue checkout on the customer dashboard, and show profile/orders/admin links under the header name.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/app/api/addresses/route.ts

@@ -0,0 +1,34 @@
+import {
+  getBearerToken,
+  jsonResponse,
+  meshkeeFetch,
+  unauthorizedResponse,
+} from "@/lib/meshkee-server";
+
+export async function GET(request: Request) {
+  const token = getBearerToken(request);
+  if (!token) return unauthorizedResponse();
+
+  const res = await meshkeeFetch("/auth/addresses", { token });
+  if (!res.ok) return jsonResponse(res.data ?? { error: "Failed" }, res.status);
+  return jsonResponse(res.data);
+}
+
+export async function POST(request: Request) {
+  const token = getBearerToken(request);
+  if (!token) return unauthorizedResponse();
+
+  const body = await request.json().catch(() => null);
+  if (!body?.province || !body?.city || !body?.address) {
+    return jsonResponse({ error: "آدرس کامل الزامی است" }, 400);
+  }
+
+  const res = await meshkeeFetch("/auth/addresses", {
+    method: "POST",
+    token,
+    body: JSON.stringify(body),
+  });
+
+  if (!res.ok) return jsonResponse(res.data ?? { error: "Failed" }, res.status);
+  return jsonResponse(res.data, res.status === 201 ? 201 : 200);
+}