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/app/globals.css

@@ -80,8 +80,8 @@ body {
   background: #FFA39C;
   color: #fff;
   border-color: #FF847B;
-  border-radius: 7px;
-  font-weight: bold;
+  border-radius: 4px;
+  font-weight: 700;
   box-shadow: 0px 0px 5px rgba(0,0,0,0.4), 0px 3px 5px rgba(0,0,0,0.25);
 }
 
@@ -109,6 +109,20 @@ body {
   border-radius: 25px;
 }
 
+/* ─── Навигация сайта ────────────────────────────────────────── */
+.bb-nav-item {
+  transition: background 0.15s;
+}
+.bb-nav-item:hover {
+  background: #f5f0e6;
+}
+.bb-nav-sub-item {
+  transition: background 0.1s;
+}
+.bb-nav-sub-item:hover {
+  background: #f5f0e6;
+}
+
 /* ─── Форм-контролы (Sprint 3) ───────────────────────────────── */
 .bb-input,
 .bb-textarea,