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/application/services/batch_operations.rs

@@ -1,12 +1,11 @@
 use std::sync::Arc;
-use thiserror::Error;
 use futures::{future::join_all, Future};
 use tokio::sync::Semaphore;
-use tracing::{info, error};
+use tracing::info;
+use thiserror::Error;
 
 use crate::application::services::file_service::FileService;
 use crate::application::services::folder_service::FolderService;
-use crate::domain::services::path_service::StoragePath;
 use crate::common::errors::DomainError;
 use crate::common::config::AppConfig;
 use crate::application::ports::inbound::FolderUseCase;
@@ -15,7 +14,6 @@ use crate::application::dtos::folder_dto::FolderDto;
 
 /// Errores específicos para operaciones por lotes
 #[derive(Debug, Error)]
-#[allow(dead_code)]
 pub enum BatchOperationError {
     #[error("Error de dominio: {0}")]
     Domain(#[from] DomainError),
@@ -59,52 +57,6 @@ pub struct BatchStats {
     pub max_concurrency: usize,
 }
 
-/// Tipo de entidad para operaciones por lotes
-#[derive(Debug, Clone, PartialEq, Eq)]
-#[allow(dead_code)]
-pub enum EntityType {
-    File,
-    Folder,
-}
-
-/// Tipo de operación por lotes
-#[derive(Debug, Clone, PartialEq, Eq)]
-#[allow(dead_code)]
-pub enum BatchOperationType {
-    Create,
-    Read,
-    Update,
-    Delete,
-    Copy,
-    Move,
-}
-
-/// Identificador para una entidad (ID o ruta)
-#[derive(Debug, Clone)]
-#[allow(dead_code)]
-pub enum EntityIdentifier {
-    Id(String),
-    Path(StoragePath),
-}
-
-impl EntityIdentifier {
-    #[allow(dead_code)]
-    pub fn as_id(&self) -> Option<&str> {
-        match self {
-            EntityIdentifier::Id(id) => Some(id),
-            _ => None,
-        }
-    }
-    
-    #[allow(dead_code)]
-    pub fn as_path(&self) -> Option<&StoragePath> {
-        match self {
-            EntityIdentifier::Path(path) => Some(path),
-            _ => None,
-        }
-    }
-}
-
 /// Servicio de operaciones por lotes
 pub struct BatchOperationService {
     file_service: Arc<FileService>,
@@ -494,7 +446,6 @@ impl BatchOperationService {
     }
     
     /// Operación genérica de lote para cualquier tipo de función asíncrona
-    #[allow(dead_code)]
     pub async fn generic_batch_operation<T, F, Fut>(
         &self,
         items: Vec<T>,