feat: add smart_tv, printer and smartphone device types

Add three new device types (21 total) with Lucide icons (Tv2, Printer,
Smartphone), colour-coded badges, and translations in fr/en/es.
No backend migration needed — type is a free string field.

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

frontend/src/components/DeviceIcon.vue

@@ -30,7 +30,7 @@ import { computed } from 'vue'
 import {
   Server, Network, Wifi, Database, Globe, GitFork,
   Camera, Thermometer, Gauge, House, PlugZap, ShieldAlert,
-  Lightbulb, BellRing, Antenna, Monitor, Laptop, Box,
+  Lightbulb, BellRing, Antenna, Monitor, Laptop, Tv2, Printer, Smartphone, Box,
 } from 'lucide-vue-next'
 import { detectBrands } from '../brandIcons.js'
 
@@ -64,6 +64,9 @@ const LUCIDE_MAP = {
   access_point: Antenna,
   desktop:      Monitor,
   laptop:       Laptop,
+  smart_tv:     Tv2,
+  printer:      Printer,
+  smartphone:   Smartphone,
   other:        Box,
 }