refactor: migrate all internal imports to package.json subpath aliases

- Add #domain, #protocol, #utils aliases to package.json imports map
- Replace all relative imports (./, ../, ../..) in app/ and
  database/mongo_migrations/ with the corresponding #alias imports,
  eliminating relative path traversal across the codebase
- Remove dead code: ConfigurationVersionModel.findByConfigurationIdentifier
  (unused, superseded by paginateVersions) and unused exception classes
  (NotFoundException, UnprocessableEntityException, DatabaseException)
  from app/exceptions/index.ts, keeping only BadRequestException
- Fix pre-existing syntax error in configuration_version.ts (mismatched
  parenthesis) that broke tsc
- Fix eqeqeq violation in configuration_service.ts and isNaN ->
  Number.isNaN in configuration_engine.ts / cwmp-1-0.ts / exchange_controller.ts
- Fix no-shadow violation in cwmp-1-0.ts EventStruct constructor
- Prettier formatting pass on touched files

Validated: tsc --noEmit clean, eslint app/ clean, full test suite green.

app/controllers/pages_controller.ts

@@ -33,11 +33,25 @@ export default class PagesController {
 
     // Predefined model paths for the "Get Model" modal
     // Detect data model from device properties to suggest the right root
-    const isTr181 = (device as any).dataModel === 'tr-181' ||
+    const isTr181 =
+      (device as any).dataModel === 'tr-181' ||
       (device as any).properties?.some((p: any) => p.name?.startsWith('Device.'))
     const modelPaths = isTr181
-      ? ['Device.', 'Device.DeviceInfo.', 'Device.IP.', 'Device.WiFi.', 'Device.ManagementServer.', 'Device.Hosts.']
-      : ['InternetGatewayDevice.', 'InternetGatewayDevice.DeviceInfo.', 'InternetGatewayDevice.LANDevice.', 'InternetGatewayDevice.WANDevice.', 'InternetGatewayDevice.ManagementServer.']
+      ? [
+          'Device.',
+          'Device.DeviceInfo.',
+          'Device.IP.',
+          'Device.WiFi.',
+          'Device.ManagementServer.',
+          'Device.Hosts.',
+        ]
+      : [
+          'InternetGatewayDevice.',
+          'InternetGatewayDevice.DeviceInfo.',
+          'InternetGatewayDevice.LANDevice.',
+          'InternetGatewayDevice.WANDevice.',
+          'InternetGatewayDevice.ManagementServer.',
+        ]
 
     return (inertia as any).render('DeviceDetail', { device, commands, modelPaths })
   }