feat: upgrade next-auth to v5.0.0-beta.29 and refactor authentication middleware

- Updated next-auth dependency in package.json to version 5.0.0-beta.29.
- Refactored create-admin script to use a valid email format.
- Implemented authentication middleware for various API routes to enforce access control.
- Refactored API route handlers to improve readability and maintainability.
- Enhanced error handling in authentication error page.
- Added detailed tests for authentication flow, including protected routes and NextAuth endpoints.

scripts/create-admin.js

@@ -10,13 +10,13 @@ async function createInitialAdmin() {
     
     const adminUser = await createUser({
       name: "Administrator",
-      email: "admin@localhost",
+      email: "admin@localhost.com",
       password: "admin123456", // Change this in production!
       role: "admin"
     })
     
     console.log("✅ Initial admin user created successfully!")
-    console.log("📧 Email: admin@localhost")
+    console.log("📧 Email: admin@localhost.com")
     console.log("🔑 Password: admin123456")
     console.log("⚠️  Please change the password after first login!")
     console.log("👤 User ID:", adminUser.id)