feat(package): add Cypress for end-to-end testing and enhance scripts

- Added Cypress as a dependency for end-to-end testing.
- Introduced new npm scripts for running Cypress tests and starting the development server for testing.
- Updated package-lock.json to reflect the new dependencies and their versions.

cypress/support/commands.ts

@@ -0,0 +1,37 @@
+/// <reference types="cypress" />
+
+const AUTH_COOKIE_KEYS = {
+  accessToken: "TENDER_PANEL_token",
+  refreshToken: "TENDER_PANEL_refresh_token",
+  user: "TENDER_PANEL_user",
+} as const;
+
+Cypress.Commands.add("loginAsAdmin", () => {
+  cy.session(
+    "admin-session",
+    () => {
+      cy.visit("/auth/sign-in");
+
+      cy.setCookie(AUTH_COOKIE_KEYS.accessToken, "e2e-access-token");
+      cy.setCookie(AUTH_COOKIE_KEYS.refreshToken, "e2e-refresh-token");
+      cy.setCookie(
+        AUTH_COOKIE_KEYS.user,
+        encodeURIComponent(
+          JSON.stringify({
+            id: "507f1f77bcf86cd799439012",
+            username: "e2e-admin",
+            email: "e2e-admin@example.com",
+            role: "admin",
+          }),
+        ),
+      );
+    },
+    {
+      validate: () => {
+        cy.getCookie(AUTH_COOKIE_KEYS.accessToken).should("exist");
+        cy.getCookie(AUTH_COOKIE_KEYS.user).should("exist");
+      },
+      cacheAcrossSpecs: true,
+    },
+  );
+});

cypress/support/e2e.ts

@@ -0,0 +1,10 @@
+/// <reference types="cypress" />
+
+// Central place for global Cypress hooks/commands.
+import "./commands";
+
+beforeEach(() => {
+  if (Cypress.env("AUTO_LOGIN") !== false) {
+    cy.loginAsAdmin();
+  }
+});

cypress/support/index.d.ts

@@ -0,0 +1,11 @@
+/// <reference types="cypress" />
+
+declare global {
+  namespace Cypress {
+    interface Chainable {
+      loginAsAdmin(): Chainable<void>;
+    }
+  }
+}
+
+export {};