feat: enhance type definitions and import structure across modules

lib/core/fluent-url.ts

@@ -4,8 +4,13 @@ import {
   normalizeConfig,
   normalizeOptions,
 } from '@/core/config-defaults'
+import { stringifyUrl } from '@/core/serializer/url-serializer'
 import { deepClone } from '@/shared/helpers/deep-clone'
-import { stringifyUrl } from './serializer/url-serializer'
+import type {
+  FLuentUrlPlainObject,
+  FluentUrlConfig,
+  QueriesPlainObject,
+} from '@/shared/types'
 
 export class FluentUrl {
   private config: FluentUrlConfig