refactor: remove serde from domain entities for Clean Architecture compliance

- Remove Serialize/Deserialize from File, Folder, Session, User, Contact entities
- Create contact_persistence_dto.rs for JSONB persistence in infrastructure layer
- Update contact_pg_repository to use persistence DTOs
- Fix dependency on zip crate (downgrade from 7.2.0 to 2.1.0)
- Fix unused variable warnings in main.rs
- Move PathService import from domain to infrastructure
- Add missing fields to CoreServices and RepositoryServices
- Create proper service initialization in main.rs

Clean Architecture improvements:
- Domain layer no longer depends on serde framework
- Persistence concerns isolated to infrastructure layer
- TokenClaims in auth_service.rs is only exception (required for JWT)

src/interfaces/api/handlers/file_handler.rs

@@ -7,10 +7,6 @@ use axum::{
 };
 use serde::Deserialize;
 use std::collections::HashMap;
-use futures::Stream;
-// use futures::StreamExt;
-use std::task::{Context, Poll};
-use std::pin::Pin;
 
 use crate::application::services::file_service::{FileService, FileServiceError};
 use crate::infrastructure::services::compression_service::{
@@ -46,35 +42,6 @@ type GlobalState = AppState;
  */
 pub struct FileHandler;
 
-// Simpler approach to make streams Unpin - use Pin<Box<dyn Stream>> directly
-struct BoxedStream<T> {
-    inner: Pin<Box<dyn Stream<Item = T> + Send + 'static>>,
-}
-
-impl<T> Stream for BoxedStream<T> {
-    type Item = T;
-
-    fn poll_next(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
-        // Accessing the field directly is safe because BoxedStream is not a structural pinning type
-        unsafe { self.get_unchecked_mut().inner.as_mut().poll_next(cx) }
-    }
-}
-
-// This is safe because BoxedStream's inner field is already Pin<Box<dyn Stream>>
-impl<T> Unpin for BoxedStream<T> {}
-
-impl<T> BoxedStream<T> {
-    #[allow(dead_code)]
-    fn new<S>(stream: S) -> Self
-    where
-        S: Stream<Item = T> + Send + 'static,
-    {
-        BoxedStream {
-            inner: Box::pin(stream),
-        }
-    }
-}
-
 impl FileHandler {
     /// Uploads a file
     pub async fn upload_file(