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/contact_service.rs

@@ -9,12 +9,11 @@ use crate::application::dtos::address_book_dto::{
 };
 use crate::application::dtos::contact_dto::{
     ContactDto, CreateContactDto, UpdateContactDto, CreateContactVCardDto,
-    ContactGroupDto, CreateContactGroupDto, UpdateContactGroupDto, GroupMembershipDto,
-    EmailDto, PhoneDto, AddressDto
+    ContactGroupDto, CreateContactGroupDto, UpdateContactGroupDto, GroupMembershipDto
 };
 use crate::application::ports::carddav_ports::{AddressBookUseCase, ContactUseCase};
 use crate::application::ports::storage_ports::StorageUseCase;
-use crate::common::errors::{DomainError, ErrorContext};
+use crate::common::errors::DomainError;
 use crate::domain::entities::contact::{AddressBook, Contact, ContactGroup, Email, Phone, Address};
 use crate::domain::repositories::address_book_repository::AddressBookRepository;
 use crate::domain::repositories::contact_repository::{ContactRepository, ContactGroupRepository};