feat: adoptar branding oficial drop.sigmac.app en templates, docs e infra

web/templates/base.html

@@ -3,7 +3,7 @@
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
-    <title>{{block "title" .}}Compartir — Pasa archivos y texto al instante{{end}}</title>
+    <title>{{block "title" .}}drop.sigmac.app — Pasa archivos y texto al instante{{end}}</title>
     <!-- Tailwind CSS CDN -->
     <script src="https://cdn.tailwindcss.com"></script>
     <script>
@@ -45,9 +45,9 @@
         <div class="max-w-6xl mx-auto px-4 h-16 flex items-center justify-between">
             <a href="/" class="flex items-center gap-2.5 font-bold text-lg tracking-tight hover:opacity-90 transition">
                 <span class="w-9 h-9 rounded-xl bg-gradient-to-tr from-brand-600 to-emerald-400 flex items-center justify-center text-slate-950 font-black shadow-lg shadow-brand-500/20">
-                    <i class="fa-solid fa-share-nodes text-base"></i>
+                    <i class="fa-solid fa-cloud-arrow-up text-base"></i>
                 </span>
-                <span class="text-white">app<span class="text-brand-500">_compartir</span></span>
+                <span class="text-white">drop<span class="text-brand-500">.sigmac.app</span></span>
             </a>
 
             <!-- User status / Actions -->
@@ -88,7 +88,7 @@
 
     <!-- Footer -->
     <footer class="border-t border-slate-900 py-6 text-center text-xs text-slate-500">
-        <p>Ecosistema Telcotronics • Pasa archivos, texto y capturas sin usar WhatsApp</p>
+        <p><strong>drop.sigmac.app</strong> • Ecosistema Telcotronics • Pasa archivos, texto y capturas sin usar WhatsApp</p>
     </footer>
 
     {{block "scripts" .}}{{end}}