Add complete Biblical Guide web application with Material UI

Implemented comprehensive Romanian Biblical Guide web app:
- Next.js 15 with App Router and TypeScript
- Material UI 7.3.2 for modern, responsive design
- PostgreSQL database with Prisma ORM
- Complete Bible reader with book/chapter navigation
- AI-powered biblical chat with Romanian responses
- Prayer wall for community prayer requests
- Advanced Bible search with filters and highlighting
- Sample Bible data imported from API.Bible
- All API endpoints created and working
- Professional Material UI components throughout
- Responsive layout with navigation and theme

🤖 Generated with [Claude Code](https://claude.ai/code)

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

lib/auth/index.ts

@@ -0,0 +1,44 @@
+import bcrypt from 'bcryptjs'
+import jwt from 'jsonwebtoken'
+import { prisma } from '@/lib/db'
+
+export async function createUser(email: string, password: string, name?: string) {
+  const passwordHash = await bcrypt.hash(password, 10)
+  return prisma.user.create({
+    data: { email, passwordHash, name }
+  })
+}
+
+export async function validateUser(email: string, password: string) {
+  const user = await prisma.user.findUnique({ where: { email } })
+  if (!user) return null
+
+  const isValid = await bcrypt.compare(password, user.passwordHash)
+  return isValid ? user : null
+}
+
+export function generateToken(userId: string): string {
+  return jwt.sign({ userId }, process.env.JWT_SECRET!, { expiresIn: '7d' })
+}
+
+export async function verifyToken(token: string) {
+  try {
+    const payload = jwt.verify(token, process.env.JWT_SECRET!) as { userId: string }
+    return payload
+  } catch (error) {
+    throw new Error('Invalid token')
+  }
+}
+
+export async function getUserFromToken(token: string) {
+  try {
+    const payload = await verifyToken(token)
+    const user = await prisma.user.findUnique({
+      where: { id: payload.userId },
+      select: { id: true, email: true, name: true, theme: true, fontSize: true }
+    })
+    return user
+  } catch (error) {
+    return null
+  }
+}