Reorganiza el routing multi-tenant: funnel por slug, B2B en raíz

- / y /b2b sirven la landing B2B estática (rewrites beforeFiles)
- /{slug} resuelve el funnel del reformista (app/[slug]/page.tsx) con
  branding propio (TenantBrand) y atribución de leads por tenant
- crearLead(slug) y páginas /solicitud usan el tenant del lead
- Panel: edición del slug del funnel + URL pública en /panel/empresa
- Helper de slugs reservados para evitar colisiones con rutas reales

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

mvp/b2c/src/app/panel/empresa/page.tsx

@@ -1,3 +1,4 @@
+import { headers } from 'next/headers';
 import { getTenantPerfil } from '@/db/tenant-queries';
 import { actualizarEmpresa } from './actions';
 import LogoUploader from '@/components/panel/LogoUploader';
@@ -7,6 +8,11 @@ export const dynamic = 'force-dynamic';
 export default async function EmpresaPage() {
   const perfil = await getTenantPerfil();
 
+  const h = await headers();
+  const host = h.get('x-forwarded-host') ?? h.get('host') ?? 'reformix.dv3.com.es';
+  const proto = h.get('x-forwarded-proto') ?? 'https';
+  const funnelUrl = `${proto}://${host}/${perfil.slug}`;
+
   return (
     <div className="space-y-10 max-w-2xl">
       <div>
@@ -34,6 +40,32 @@ export default async function EmpresaPage() {
               className="w-full border border-gray-300 rounded-lg px-3 py-2"
             />
           </label>
+          <label className="text-sm md:col-span-2">
+            <span className="block text-gray-500 mb-1">Enlace de tu funnel *</span>
+            <div className="flex items-center border border-gray-300 rounded-lg overflow-hidden">
+              <span className="px-3 py-2 text-gray-400 bg-gray-50 border-r border-gray-200 select-none whitespace-nowrap">
+                {host}/
+              </span>
+              <input
+                name="slug"
+                required
+                defaultValue={perfil.slug}
+                pattern="[a-z0-9-]+"
+                className="flex-1 px-3 py-2 outline-none min-w-0"
+              />
+            </div>
+            <span className="block text-gray-400 mt-1.5 text-xs">
+              Esta es la dirección que compartes con tus clientes:{' '}
+              <a
+                href={funnelUrl}
+                target="_blank"
+                rel="noopener noreferrer"
+                className="text-black underline underline-offset-2 break-all"
+              >
+                {funnelUrl}
+              </a>
+            </span>
+          </label>
           <label className="text-sm">
             <span className="block text-gray-500 mb-1">CIF / NIF</span>
             <input