feat: endpoint webhook Clientify para sync en tiempo real

URL pública por tenant (?tenant=slug) para contactos y oportunidades;
middleware permite POST sin sesión.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/middleware.ts

@@ -52,10 +52,11 @@ export async function middleware(req: NextRequest) {
   const url = req.nextUrl.clone();
   const path = url.pathname;
 
-  // Public: login, attribution script, health
+  // Public: login, attribution script, health, inbound webhooks (CRM)
   const isPublic =
     path === '/login' ||
     path === '/api/health' ||
+    path.startsWith('/api/webhooks/') ||
     path === '/_4v_attr.js' ||
     path.startsWith('/_next') ||
     path === '/favicon.ico' ||