feat: implement customizable funnel stages per tenant

- Modified attendances.funnel_stage in DB from ENUM to VARCHAR.

- Created tenant_funnels table and backend API routes to manage custom stages.

- Added /admin/funnels page for Admins/Managers to create, edit, order, and color-code their funnel stages.

- Updated Dashboard, UserDetail, and AttendanceDetail to fetch and render dynamic funnel stages instead of hardcoded enums.

- Added defensive checks and logging to GET /users/:idOrSlug to fix sporadic 500 errors during impersonation handoffs.

fix_db.js

@@ -0,0 +1,10 @@
+const mysql = require('mysql2/promise');
+async function run() {
+  const pool = mysql.createPool({ host: '127.0.0.1', user: 'root', password: 'secret_pass', database: 'fasto_db', port: 3306 });
+  try {
+     await pool.query("ALTER TABLE attendances MODIFY COLUMN funnel_stage VARCHAR(255) NOT NULL DEFAULT 'Novo'");
+     console.log("Success");
+  } catch(e) { console.error(e); }
+  pool.end();
+}
+run();