feat(sprint-5.5): add "Save version" button, update navigation block and block components

- Add "Сохранить версию" button to BlockMetaBar that persists current
  version + changelog from code to PostgreSQL via PATCH API
- Update navigation page: menu items section now renders like live example
  with underlined links, hover dropdowns, and submenus
- Restore uncommitted changes from previous session (thirsty-mayer worktree):
  navigation v1.3 with dropdowns, updated hero/ceo/doctors/reviews/news/
  contact-forms/footer blocks, navData.ts extraction, seed updates
- Extract nav menu data to shared navData.ts module

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/web/components/blocks/HeroBlock.tsx

@@ -75,26 +75,17 @@ export function HeroBlock() {
       </div>
 
       {/* Под баннером: соцсети + просмотры */}
-      <div className="flex items-center gap-3 pt-1">
-        <span className="text-xs" style={{ color: "#9ca3af" }}>
-          Поделиться:
-        </span>
-        {["VK", "FB", "TW"].map((s) => (
-          <button
-            key={s}
-            className="text-xs px-2 py-1 rounded"
-            style={{
-              background: "#f9fafb",
-              border: "1px solid #e5e7eb",
-              color: "#9ca3af",
-            }}
-          >
-            {s}
-          </button>
-        ))}
-        <span className="text-xs ml-2" style={{ color: "#9ca3af" }}>
-          👁 98 573 просмотра
-        </span>
+      <div className="flex items-center gap-2 pt-1">
+        <button
+          className="text-xs px-3 py-1.5 rounded"
+          style={{
+            background: "#f9fafb",
+            border: "1px solid #e5e7eb",
+            color: "#9ca3af",
+          }}
+        >
+          Поделиться ✉ 98572
+        </button>
       </div>
     </div>
   );