feat: initial NFC Attendance Hub implementation

- Multi-tenant client management with unique API keys
- Semaphore SMS integration (per-client key + sender name + credit balance)
- DB-based SMS queue with 3-attempt retry and exponential backoff
- Failed SMS dashboard with manual retry button
- Reports page with date/client filter and CSV export
- Admin auth via NextAuth (email/password)
- Docker Compose setup (app + PostgreSQL 16)
- Prisma 5 schema with SmsQueue, SmsLog, Client, User models

Tech: Next.js 14 App Router + TypeScript + Tailwind CSS + Prisma + PostgreSQL

lib/auth.ts

@@ -0,0 +1,54 @@
+import { NextAuthOptions } from 'next-auth'
+import CredentialsProvider from 'next-auth/providers/credentials'
+import { prisma } from '@/lib/prisma'
+import bcrypt from 'bcryptjs'
+
+export const authOptions: NextAuthOptions = {
+  providers: [
+    CredentialsProvider({
+      name: 'credentials',
+      credentials: {
+        email: { label: 'Email', type: 'email' },
+        password: { label: 'Password', type: 'password' },
+      },
+      async authorize(credentials) {
+        if (!credentials?.email || !credentials?.password) return null
+
+        const user = await prisma.user.findUnique({
+          where: { email: credentials.email },
+        })
+
+        if (!user) return null
+
+        const passwordMatch = await bcrypt.compare(credentials.password, user.password)
+        if (!passwordMatch) return null
+
+        return {
+          id: user.id,
+          email: user.email,
+          name: user.name,
+          role: user.role,
+        }
+      },
+    }),
+  ],
+  session: { strategy: 'jwt' },
+  pages: { signIn: '/login' },
+  callbacks: {
+    async jwt({ token, user }) {
+      if (user) {
+        token.id = user.id
+        token.role = (user as any).role
+      }
+      return token
+    },
+    async session({ session, token }) {
+      if (session.user) {
+        (session.user as any).id = token.id as string
+        ;(session.user as any).role = token.role as string
+      }
+      return session
+    },
+  },
+  secret: process.env.NEXTAUTH_SECRET,
+}