fix: remove duplicate showToast declaration causing JavaScript error

Root cause: admin_pricing.html declared 'const showToast' while base.html
already defined 'function showToast', causing SyntaxError that prevented
all JavaScript from executing on the admin pricing page.

Changes:
- Removed duplicate showToast declaration from admin_pricing.html (lines 206-210)
- Removed debug logging added in previous commit
- Kept immediate function calls in base.html to ensure early initialization

This fixes the issue where username and "Администратор цен" link
disappeared when navigating to /admin/pricing.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

web/templates/admin_pricing.html

@@ -203,12 +203,6 @@
 </div>
 
 <script>
-// Fallback showToast function for cases where base.html isn't loaded properly
-const showToast = window.showToast || function(msg, type) {
-    // Simple fallback: just alert the message
-    alert(`${type ? type + ': ' : ''}${msg}`);
-};
-
 let currentTab = 'alerts';
 let currentPage = 1;
 let totalPages = 1;