Add comprehensive testing framework for both single site and multisite WordPress environments

cypress/e2e/single-site.cy.js

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+describe('WordPress Single Site Tests', () => {
+  it('Can access the site', () => {
+    cy.visit('/');
+    cy.get('body').should('exist');
+  });
+
+  it('Can login to the admin area', () => {
+    cy.visit('/wp-admin');
+    cy.get('#user_login').type('admin');
+    cy.get('#user_pass').type('password');
+    cy.get('#wp-submit').click();
+    cy.get('body.wp-admin').should('exist');
+  });
+
+  it('Plugin is activated', () => {
+    // Login first
+    cy.visit('/wp-admin');
+    cy.get('#user_login').type('admin');
+    cy.get('#user_pass').type('password');
+    cy.get('#wp-submit').click();
+    
+    // Check plugins page
+    cy.visit('/wp-admin/plugins.php');
+    cy.contains('tr', 'WP Plugin Starter Template').should('contain', 'Deactivate');
+  });
+});