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/infrastructure/services/compression_service.rs

@@ -48,14 +48,12 @@ pub trait CompressionService: Send + Sync {
     async fn decompress_data(&self, compressed_data: &[u8]) -> io::Result<Vec<u8>>;
     
     /// Comprime un stream de datos
-    #[allow(dead_code)]
     fn compress_stream<S>(&self, stream: S, level: CompressionLevel) 
         -> impl Stream<Item = io::Result<Bytes>> + Send
     where
         S: Stream<Item = io::Result<Bytes>> + Send + 'static + Unpin;
     
     /// Descomprime un stream de datos
-    #[allow(dead_code)]
     fn decompress_stream<S>(&self, compressed_stream: S) 
         -> impl Stream<Item = io::Result<Bytes>> + Send
     where