Seguridad y docs: fix SQLi en updatePost, middleware por segmentos exactos, cover-cache directo al upstream, JWT sin fallback hardcodeado, password sudo fuera de deploy/setup.sh; reescritura AGENTS.md y CLAUDE.md

src/app/(public)/layout.tsx

@@ -1,5 +1,5 @@
 import Link from "next/link"
-import { Image, Search, Shield } from "lucide-react"
+import { Image, Search } from "lucide-react"
 
 export default function PublicLayout({ children }: { children: React.ReactNode }) {
   return (
@@ -20,13 +20,6 @@ export default function PublicLayout({ children }: { children: React.ReactNode }
               <Search className="h-4 w-4" />
               <span className="hidden sm:inline">Buscar</span>
             </Link>
-            <Link
-              href="/feed"
-              className="flex items-center gap-1.5 rounded-lg px-2.5 py-1.5 text-xs text-[var(--muted)] hover:bg-[var(--surface)] hover:text-[var(--foreground)] transition-colors"
-            >
-              <Shield className="h-4 w-4" />
-              <span className="hidden sm:inline">Admin</span>
-            </Link>
           </nav>
         </div>
       </header>