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/webdav_handler.rs

@@ -22,7 +22,7 @@ use crate::common::di::AppState;
 use crate::application::adapters::webdav_adapter::{WebDavAdapter, PropFindRequest, LockInfo, LockScope, LockType};
 use crate::interfaces::middleware::auth::CurrentUser;
 use crate::application::dtos::folder_dto::FolderDto;
-use crate::common::errors::AppError;
+use crate::interfaces::errors::AppError;
 
 // Create a custom DAV header since it's not in the standard headers
 const HEADER_DAV: HeaderName = HeaderName::from_static("dav");