Align frontend device types with backend canonical list

Replaces the old frontend-only `router` type and adds the full set used
by the backend: network_appliance, home_security, home_appliance, watch,
pc, gaming_console. Adds an `apiName` getter to map camelCase enum values
to the snake_case strings the API expects. Updates the unknown device icon
to a question mark.

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

TODO.md

@@ -24,8 +24,8 @@
 - [x] Use date filter from backend API for device events list
 - [x] Use favicon in web frontend
 - [x] Style app title like favicon (font Barlow Condensed in a pill format with "primary" background)
-- [ ] Update the device type management to consider the following list: phone, laptop, tablet, server, tv, printer, network_appliance (router, switch, firewall, etc.), home_security (camera, doorbell, etc.), home_appliance (fridge, dish washer, washer, dryer, etc.), watch, pc, gaming_console, unknown (use when a vendor cannot be clearly identified with any of the device types or a device is of a vendor not in the vendors json file)
+- [x] Update the device type management to consider the following list: phone, laptop, tablet, server, tv, printer, network_appliance (router, switch, firewall, etc.), home_security (camera, doorbell, etc.), home_appliance (fridge, dish washer, washer, dryer, etc.), watch, pc, gaming_console, unknown (use when a vendor cannot be clearly identified with any of the device types or a device is of a vendor not in the vendors json file)
-- [ ] Change the unkown device icon (maybe just a question mark)
+- [x] Change the unkown device icon (maybe just a question mark)
 - [ ] Scan process monitor and summary page
   - [ ] Is the scan process running
   - [ ] Last run (when, how long did it take, how many devices did it found)

frontend/lib/devices/device_actions.dart

@@ -121,7 +121,7 @@ Future<void> showRegisterDeviceDialog(
     await BackendAPI.instance.registerDevice(
       device.macAddress,
       owner,
-      deviceType.name,
+      deviceType.apiName,
     );
     if (!context.mounted) return;
     UISnackbars.showSuccess(context, 'Device registered');

frontend/lib/model/device_type.dart

@@ -5,9 +5,14 @@ enum DeviceType {
   laptop,
   tablet,
   server,
-  router,
   tv,
   printer,
+  networkAppliance,
+  homeSecurity,
+  homeAppliance,
+  watch,
+  pc,
+  gamingConsole,
   unknown;
 
   IconData get icon => switch (this) {
@@ -15,23 +20,50 @@ enum DeviceType {
     laptop => Icons.laptop,
     tablet => Icons.tablet_android,
     server => Icons.dns,
-    router => Icons.router,
     tv => Icons.tv,
     printer => Icons.print,
-    unknown => Icons.device_unknown,
+    networkAppliance => Icons.device_hub,
+    homeSecurity => Icons.security,
+    homeAppliance => Icons.kitchen,
+    watch => Icons.watch,
+    pc => Icons.computer,
+    gamingConsole => Icons.sports_esports,
+    unknown => Icons.question_mark,
   };
 
-  String get label =>
+  String get label => switch (this) {
-      this == unknown ? 'Unknown' : name[0].toUpperCase() + name.substring(1);
+    tv => 'TV',
+    pc => 'PC',
+    _ =>
+      name
+          .replaceAllMapped(RegExp(r'[A-Z]'), (m) => ' ${m.group(0)}')
+          .trim()
+          .split(' ')
+          .map((w) => w[0].toUpperCase() + w.substring(1))
+          .join(' '),
+  };
+
+  String get apiName => switch (this) {
+    networkAppliance => 'network_appliance',
+    homeSecurity => 'home_security',
+    homeAppliance => 'home_appliance',
+    gamingConsole => 'gaming_console',
+    _ => name,
+  };
 
   static DeviceType fromString(String value) => switch (value.toLowerCase()) {
     'phone' => phone,
     'laptop' => laptop,
     'tablet' => tablet,
     'server' => server,
-    'router' => router,
     'tv' => tv,
     'printer' => printer,
+    'network_appliance' => networkAppliance,
+    'home_security' => homeSecurity,
+    'home_appliance' => homeAppliance,
+    'watch' => watch,
+    'pc' => pc,
+    'gaming_console' => gamingConsole,
     _ => unknown,
   };
 }

frontend/lib/utils/oott_api.dart

@@ -104,7 +104,7 @@ class BackendAPI {
     if (owner != null && owner.isNotEmpty) params['owner'] = owner;
     if (deviceType != null) {
       params['device_type'] =
-          deviceType == DeviceType.unknown ? '' : deviceType.name;
+          deviceType == DeviceType.unknown ? '' : deviceType.apiName;
     }
 
     final response = await _dio.get('/devices', queryParameters: params);