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  (unused, superseded by paginateVersions) and unused exception classes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/services/cwmp/task_queue.ts

@@ -1,6 +1,6 @@
-import { type DeviceId } from '../../domain/device/device_id.js'
+import { type DeviceId } from '#domain/device/device_id'
 import { EventEmitter } from 'node:events'
-import { CWMPMessageBuilder } from '../../protocol/common/cwmp_message_builder.js'
+import { CWMPMessageBuilder } from '#protocol/common/cwmp_message_builder'
 import logger from '@adonisjs/core/services/logger'
 import type {
   CWMPTaskType,
@@ -12,7 +12,7 @@ import type {
   DownloadTaskPayload,
   UploadTaskPayload,
   RebootTaskPayload,
-} from '../../protocol/tr069_types.js'
+} from '#protocol/tr069_types'
 
 export class TaskResult {
   status!: ResultStatus