fix: remove boot call from private init() to prevent hash-URL double-boot

Private init() and lt.init() both called runBoot(), creating two code paths.
With base.html# URLs the sessionStorage guard could be bypassed causing every
boot line to appear twice. Boot is now exclusively triggered by lt.init() or
lt.boot.run(), which already has its own _ltInitialized guard.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

base.js

@@ -1333,9 +1333,7 @@
     /* v1.3 */
     initMobileNav();
     initSidebarSubmenus();
-    /* Boot */
+    /* Boot is handled exclusively by lt.init() or lt.boot.run() to avoid double-init */
-    const bootEl = document.getElementById('lt-boot');
-    if (bootEl) runBoot(bootEl.dataset.appName || document.title);
   }
 
   if (document.readyState === 'loading') {