Initial scaffold: full-stack RackMapper application

Complete project scaffold with working auth, REST API, Prisma/SQLite
schema, Docker config, and React frontend for both Rack Planner and
Service Mapper modules. Both server and client pass TypeScript strict
mode with zero errors. Initial migration applied.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/services/vlanService.ts

@@ -0,0 +1,37 @@
+import { prisma } from '../lib/prisma';
+import { AppError } from '../types/index';
+
+export async function listVlans() {
+  return prisma.vlan.findMany({ orderBy: { vlanId: 'asc' } });
+}
+
+export async function createVlan(data: {
+  vlanId: number;
+  name: string;
+  description?: string;
+  color?: string;
+}) {
+  const existing = await prisma.vlan.findUnique({ where: { vlanId: data.vlanId } });
+  if (existing) throw new AppError(`VLAN ID ${data.vlanId} already exists`, 409, 'DUPLICATE');
+
+  if (data.vlanId < 1 || data.vlanId > 4094) {
+    throw new AppError('VLAN ID must be between 1 and 4094', 400, 'INVALID_VLAN_ID');
+  }
+
+  return prisma.vlan.create({ data });
+}
+
+export async function updateVlan(
+  id: string,
+  data: Partial<{ name: string; description: string; color: string }>
+) {
+  const existing = await prisma.vlan.findUnique({ where: { id } });
+  if (!existing) throw new AppError('VLAN not found', 404, 'NOT_FOUND');
+  return prisma.vlan.update({ where: { id }, data });
+}
+
+export async function deleteVlan(id: string) {
+  const existing = await prisma.vlan.findUnique({ where: { id } });
+  if (!existing) throw new AppError('VLAN not found', 404, 'NOT_FOUND');
+  return prisma.vlan.delete({ where: { id } });
+}