fix: include missing files for tenant impersonation feature

- Added backend impersonate endpoint.

- Added frontend impersonate button and functions.

- Fixed build failure by including missing exported functions in dataService.ts.

services/dataService.ts

@@ -387,6 +387,50 @@ export const login = async (credentials: any): Promise<any> => {
   return data;
 };
 
+export const impersonateTenant = async (tenantId: string): Promise<any> => {
+  const response = await fetch(`${API_URL}/impersonate/${tenantId}`, {
+    method: 'POST',
+    headers: getHeaders()
+  });
+
+  const contentType = response.headers.get("content-type");
+  const isJson = contentType && contentType.indexOf("application/json") !== -1;
+
+  if (!response.ok) {
+    const errorData = isJson ? await response.json() : { error: 'Erro no servidor' };
+    throw new Error(errorData.error || 'Erro ao assumir identidade');
+  }
+
+  const data = await response.json();
+  const oldToken = localStorage.getItem('ctms_token');
+  if (oldToken) {
+    localStorage.setItem('ctms_super_admin_token', oldToken);
+  }
+  
+  localStorage.setItem('ctms_token', data.token);
+  localStorage.setItem('ctms_user_id', data.user.id);
+  localStorage.setItem('ctms_tenant_id', data.user.tenant_id || '');
+  return data;
+};
+
+export const returnToSuperAdmin = (): boolean => {
+  const superAdminToken = localStorage.getItem('ctms_super_admin_token');
+  if (superAdminToken) {
+    try {
+      const payload = JSON.parse(atob(superAdminToken.split('.')[1]));
+      localStorage.setItem('ctms_token', superAdminToken);
+      localStorage.setItem('ctms_user_id', payload.id);
+      localStorage.setItem('ctms_tenant_id', payload.tenant_id || 'system');
+      localStorage.removeItem('ctms_super_admin_token');
+      return true;
+    } catch (e) {
+      console.error("Failed to restore super admin token", e);
+      return false;
+    }
+  }
+  return false;
+};
+
 export const register = async (userData: any): Promise<boolean> => {
   const response = await fetch(`${API_URL}/auth/register`, {
     method: 'POST',