feat(admin): rewrite orders page with tabs, search, multi-select filters

- AdminOrdersPanel: clean rewrite matching earth-tone theme
- Add status tabs (All/Pending/Picked Up) with pill-style buttons
- Add search bar for name, phone, order ID
- Add stop multi-select dropdown with checkbox filter
- Standard 7-column table with pagination
- UpgradePlanModal: Apple HIG glass-style modal component
- DashboardHeader: reusable header with upgrade modal integration
- DashboardUpgradeButton: standalone upgrade button component
- Update stripe-checkout to support annual billing period
- Fix readability in tools/addons section (darker badges)

src/app/robots.ts

@@ -0,0 +1,24 @@
+import { MetadataRoute } from "next";
+
+const BASE_URL = process.env.NEXT_PUBLIC_SITE_URL ?? "https://yourdomain.com";
+
+export default function robots(): MetadataRoute.Robots {
+  return {
+    rules: [
+      {
+        userAgent: "*",
+        allow: "/",
+        disallow: [
+          "/admin/*",
+          "/api/*",
+          "/wholesale/portal", // Wholesale is behind auth anyway
+          "/cart",
+          "/checkout",
+          "/water/admin/*",
+        ],
+      },
+    ],
+    sitemap: `${BASE_URL}/sitemap.xml`,
+    host: BASE_URL,
+  };
+}