feat: add admin dashboard and core API routes with Docker configuration

app/api/messages/route.ts

@@ -1,16 +1,19 @@
 import { NextRequest, NextResponse } from 'next/server'
 import prisma from '@/lib/prisma'
+import { getAuthUser } from '@/lib/auth-utils'
 
 // POST /api/messages — Send a message or start a conversation
 export async function POST(request: NextRequest) {
     try {
-        const userId = request.headers.get('x-user-id')
+        const authUser = await getAuthUser(request)
         const { businessId, conversationId, content } = await request.json()
 
-        if (!userId) {
+        if (!authUser) {
             return NextResponse.json({ error: 'Utilisateur non identifié' }, { status: 401 })
         }
 
+        const userId = authUser.id
+
         if (!content) {
             return NextResponse.json({ error: 'Contenu manquant' }, { status: 400 })
         }