fix: dashboard card order, nav labels from DB, pricing rental info

- Dashboard cards reordered to match sidebar nav sequence
- Added missing "Формы записи" card to dashboard
- Nav menu reads section titles from DOM headings (not hardcoded)
- Pricing: moved subtitle inside Абонементы tab, renamed to "Доп. информация"
- Pricing: added "Доп. информация" field to Аренда tab

src/components/sections/Pricing.tsx

@@ -156,6 +156,11 @@ export function Pricing({ data: pricing }: PricingProps) {
 
         {/* Rental tab */}
         <div id="tabpanel-rental" role="tabpanel" aria-labelledby="tab-rental" className={activeTab === "rental" ? "block" : "hidden"}>
+          {pricing.rentalSubtitle && (
+            <p className="mx-auto mt-6 max-w-2xl text-center text-sm text-neutral-500 dark:text-neutral-400">
+              {pricing.rentalSubtitle}
+            </p>
+          )}
           <div className="mx-auto mt-10 max-w-2xl space-y-3">
             {pricing.rentalItems.map((item, i) => (
               <div