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  (unused, superseded by paginateVersions) and unused exception classes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/middleware/cwmp_middleware.ts

@@ -1,7 +1,7 @@
 import type { HttpContext } from '@adonisjs/core/http'
 import type { NextFn } from '@adonisjs/core/types/http'
-import { parseSoapXml, extractCwmpMessage } from '../protocol/soap.js'
-import type { SoapEnvelope, CwmpMessage } from '../protocol/tr069_types.js'
+import { parseSoapXml, extractCwmpMessage } from '#protocol/soap'
+import type { SoapEnvelope, CwmpMessage } from '#protocol/tr069_types'
 
 /**
  * CWMP Middleware

app/middleware/inertia_middleware.ts

@@ -3,6 +3,10 @@ import type { HttpContext } from '@adonisjs/core/http'
 import type { NextFn } from '@adonisjs/core/types/http'
 
 export default class InertiaMiddleware extends BaseInertiaMiddleware {
+  /**
+   * Implements BaseInertiaMiddleware's abstract `share` method.
+   * Invoked internally by @adonisjs/inertia — not called directly from this codebase.
+   */
   async share(ctx: HttpContext) {
     return {
       errors: ctx.session?.flashMessages.get('errors'),
@@ -13,6 +17,11 @@ export default class InertiaMiddleware extends BaseInertiaMiddleware {
     }
   }
 
+  /**
+   * Standard AdonisJS middleware entrypoint.
+   * Invoked dynamically by AdonisJS via the named middleware loader in start/kernel.ts —
+   * not called directly from this codebase.
+   */
   async handle(ctx: HttpContext, next: NextFn) {
     await this.init(ctx)
     await next()