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.

test-mysql.js

@@ -0,0 +1,23 @@
+const mysql = require('mysql2/promise');
+
+async function test() {
+  const pool = mysql.createPool({ host: '127.0.0.1', user: 'root', password: 'secret_pass', database: 'fasto_db', port: 3306 });
+  try {
+    const [rows] = await pool.query('SELECT * FROM users WHERE id = ? OR slug = ?', ['u_71657ec7', 'u_71657ec7']);
+    console.log("ROWS:", rows);
+    // Simulate req.user
+    const req = { user: { role: 'super_admin', tenant_id: 'system' } };
+    
+    if (req.user.role !== 'super_admin' && rows[0].tenant_id !== req.user.tenant_id) {
+       console.log("Access Denied");
+    } else {
+       console.log("Access Granted");
+    }
+
+  } catch (err) {
+    console.error("ERROR:", err);
+  } finally {
+    await pool.end();
+  }
+}
+test();