Add initial project files

apps/backend/app/exceptions/web_manager_exceptions.ts

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+import ApiException from '#exceptions/api_exception'
+
+export class PageNotFoundException extends ApiException {
+  static status = 404
+  static code = 'E_PAGE_NOT_FOUND'
+
+  constructor(resource: string = 'Page') {
+    super(`${resource} not found`)
+  }
+}
+
+export class PageRouteConflictException extends ApiException {
+  static status = 409
+  static code = 'E_PAGE_ROUTE_CONFLICT'
+
+  constructor(locale: string, path: string) {
+    super(`A page already uses /${locale}/${path}`)
+  }
+}
+
+export class PageNotPublishedException extends ApiException {
+  static status = 409
+  static code = 'E_PAGE_NOT_PUBLISHED'
+
+  constructor() {
+    super('Only a published page can be unpublished')
+  }
+}
+
+export class InvalidPagePayloadException extends ApiException {
+  static status = 422
+  static code = 'E_INVALID_PAGE_PAYLOAD'
+
+  constructor(message: string = 'Invalid page payload') {
+    super(message)
+  }
+}
+
+export class PageMediaFileMissingException extends ApiException {
+  static status = 422
+  static code = 'E_PAGE_MEDIA_FILE_MISSING'
+
+  constructor(fileKey: string) {
+    super(`Missing uploaded file for key "${fileKey}"`)
+  }
+}
+
+export class PageMediaFileInvalidException extends ApiException {
+  static status = 422
+  static code = 'E_PAGE_MEDIA_FILE_INVALID'
+
+  constructor(fileKey: string, message?: string) {
+    super(message || `Invalid uploaded file for key "${fileKey}"`)
+  }
+}