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/middleware/auth.rs

@@ -9,14 +9,8 @@ use axum::{
 
 use crate::common::di::AppState;
 
-// Extensión para almacenar datos del usuario autenticado
-#[derive(Clone, Debug)]
-pub struct CurrentUser {
-    pub id: String,
-    pub username: String,
-    pub email: String,
-    pub role: String,
-}
+// Re-export CurrentUser from application layer for use in handlers
+pub use crate::application::dtos::user_dto::CurrentUser;
 
 // Estructura para usar en extractores de Axum
 #[derive(Clone, Debug)]