feat(nodes): add firewall node type

New 'firewall' NodeType with Flame icon. Wired through node registry,
icon registry, all six themes (red-tinted accent per palette), NodeModal
Hardware group, and CustomStyleModal editable types.

frontend/src/types/__tests__/types.test.ts

@@ -4,7 +4,7 @@ import type { CheckMethod } from '@/types'
 
 describe('NODE_TYPE_LABELS', () => {
   it('has an entry for every node type', () => {
-    const expectedTypes = ['isp', 'router', 'switch', 'server', 'proxmox', 'vm', 'lxc', 'nas', 'iot', 'ap', 'camera', 'generic']
+    const expectedTypes = ['isp', 'router', 'firewall', 'switch', 'server', 'proxmox', 'vm', 'lxc', 'nas', 'iot', 'ap', 'camera', 'generic']
     expectedTypes.forEach((t) => {
       expect(NODE_TYPE_LABELS).toHaveProperty(t)
       expect(typeof NODE_TYPE_LABELS[t as keyof typeof NODE_TYPE_LABELS]).toBe('string')

frontend/src/types/index.ts

@@ -1,6 +1,7 @@
 export type NodeType =
   | 'isp'
   | 'router'
+  | 'firewall'
   | 'switch'
   | 'server'
   | 'proxmox'
@@ -116,6 +117,7 @@ export interface EdgeData extends Record<string, unknown> {
 export const NODE_TYPE_LABELS: Record<NodeType, string> = {
   isp: 'ISP / Modem',
   router: 'Router',
+  firewall: 'Firewall',
   switch: 'Switch',
   server: 'Server',
   proxmox: 'Proxmox VE',