docs: update version in README installer example v1.1.0 → v1.2.11

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

Author: thiagofinch

README.md

@@ -809,7 +809,7 @@ $ npx mega-brain-ai install
  | |  | |  __/ (_| | (_| | |_) | | | (_| | | | | |
  |_|  |_|\___|\__, |\__,_|____/|_|  \__,_|_|_| |_|
               |___/
-                    AI Knowledge Management System v1.1.0
+                    AI Knowledge Management System v1.2.11
 
   Bem-vindo ao instalador do Mega Brain!