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

app/api/queue/process/route.ts

@@ -0,0 +1,17 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { processQueue } from '@/lib/queue-processor'
+
+export async function POST(req: NextRequest) {
+  const internalKey = req.headers.get('x-internal-key')
+  if (internalKey !== (process.env.INTERNAL_API_KEY || '')) {
+    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
+  }
+
+  try {
+    const result = await processQueue()
+    return NextResponse.json({ success: true, ...result })
+  } catch (err: any) {
+    console.error('[Queue Process]', err)
+    return NextResponse.json({ error: 'Processing failed' }, { status: 500 })
+  }
+}