feat(auth): enhance authentication system with multi-user support and admin role management

- Implemented multi-user authentication with role-based access control.
- Added environment variables for initial admin user setup.
- Updated README and example environment file with new authentication options.
- Introduced user and system configuration models in the database schema.
- Enhanced authentication middleware to support user registration and role management.
- Updated frontend to handle new authentication flows, including admin user creation and role updates.

e2e/tests/auth.spec.ts

@@ -1,16 +1,19 @@
 import { test, expect } from "./fixtures";
 
 test.describe("Authentication", () => {
+  test.use({ skipAuth: true });
+
   test("should require login and allow logout", async ({ page }) => {
     const username = process.env.AUTH_USERNAME || "admin";
-    const password = process.env.AUTH_PASSWORD || "admin";
+    const password = process.env.AUTH_PASSWORD || "admin123";
 
     await page.context().clearCookies();
     await page.goto("/");
 
-    await expect(page.getByText("Sign in to access your drawings")).toBeVisible();
+    const signInPrompt = page.getByText("Sign in to access your drawings");
+    await expect(signInPrompt).toBeVisible();
 
-    await page.getByLabel("Username").fill(username);
+    await page.getByLabel("Username or Email").fill(username);
     await page.getByLabel("Password").fill(password);
     await page.getByRole("button", { name: "Sign in" }).click();
 
@@ -22,6 +25,8 @@ test.describe("Authentication", () => {
     await expect(logoutButton).toBeVisible();
     await logoutButton.click();
 
-    await expect(page.getByText("Sign in to access your drawings")).toBeVisible();
+    await expect(signInPrompt).toBeVisible();
+
+    await page.context().clearCookies();
   });
 });