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

app/api/conversations/[id]/route.ts

@@ -1,5 +1,6 @@
 import { NextRequest, NextResponse } from 'next/server'
 import prisma from '../../../../lib/prisma'
+import { getAuthUser } from '@/lib/auth-utils'
 
 // GET /api/conversations/[id] — Get messages for a conversation
 export async function GET(
@@ -7,13 +8,15 @@ export async function GET(
     context: { params: Promise<{ id: string }> }
 ): Promise<Response> {
     try {
-        const userId = request.headers.get('x-user-id')
+        const authUser = await getAuthUser(request)
         const { id } = await context.params
 
-        if (!userId) {
+        if (!authUser) {
             return NextResponse.json({ error: 'Utilisateur non identifié' }, { status: 401 })
         }
 
+        const userId = authUser.id
+
         // Verify user is a participant
         const isParticipant = await prisma.conversationParticipant.findUnique({
             where: {