feat: habilitar set completo de APIs de Google Maps y actualizar llaves funcionales para produccion

frontend/src/views/AuthView.vue

@@ -39,6 +39,12 @@ onMounted(async () => {
     <div class="auth-glow" aria-hidden="true"></div>
 
     <div class="auth-wrapper">
+      <!-- Botón volver al mapa -->
+      <button class="back-to-map" @click="router.push('/map')">
+        <span class="material-icons">arrow_back</span>
+        Volver al mapa
+      </button>
+
       <!-- Branding -->
       <div class="auth-brand">
         <h1 class="brand-title">SIBU</h1>
@@ -191,6 +197,34 @@ onMounted(async () => {
   transform: translateX(-16px);
 }
 
+/* ─── Botón volver ─── */
+.back-to-map {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  background: var(--bg-secondary);
+  border: 1px solid var(--border-color);
+  color: var(--text-secondary);
+  font-size: 0.85rem;
+  font-weight: 700;
+  font-family: inherit;
+  padding: 10px 16px;
+  border-radius: 12px;
+  cursor: pointer;
+  transition: all 0.2s ease;
+  align-self: flex-start;
+}
+
+.back-to-map:hover {
+  color: var(--active-color);
+  border-color: var(--active-color);
+  background: rgba(254, 231, 21, 0.06);
+}
+
+.back-to-map .material-icons {
+  font-size: 18px;
+}
+
 /* ─── Footer ─── */
 .auth-footer {
   text-align: center;