Rewrite old E2E tests to use fixture-based API mocking, eliminating need for real credentials

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cypress/support/commands.js

@@ -10,22 +10,9 @@
 // -- This is a parent command --
 import '@4tw/cypress-drag-drop'
 
-const loginApiUrl = Cypress.env('loginApiUrl');
-
 Cypress.Commands.add('login', () => {
-  cy.request({
-    method: 'POST',
-    url: loginApiUrl,
-    form: true,
-    body: {
-      username: Cypress.env('user').username,
-      password: Cypress.env('user').password,
-      grant_type: 'password',
-    }
-  }).then(response => {
-    const token = response.body.access_token;
-    cy.setCookie('luciaToken', token);
-  })
+  cy.setCookie('luciaToken', 'fake-access-token-for-testing');
+  cy.setCookie('isLuciaLoggedIn', 'true');
 });
 // 呼叫方式: cy.login()
 // -- This is a child command --