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/domain/entities/contact.rs

@@ -1,8 +1,7 @@
 use chrono::{DateTime, NaiveDate, Utc};
-use serde::{Deserialize, Serialize};
-use sqlx::types::Uuid;
+use uuid::Uuid;
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone)]
 pub struct AddressBook {
     pub id: Uuid,
     pub name: String,
@@ -29,21 +28,21 @@ impl Default for AddressBook {
     }
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone)]
 pub struct Email {
     pub email: String,
     pub r#type: String, // home, work, other
     pub is_primary: bool,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone)]
 pub struct Phone {
     pub number: String,
     pub r#type: String, // mobile, home, work, fax, other
     pub is_primary: bool,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone)]
 pub struct Address {
     pub street: Option<String>,
     pub city: Option<String>,
@@ -54,7 +53,7 @@ pub struct Address {
     pub is_primary: bool,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone)]
 pub struct Contact {
     pub id: Uuid,
     pub address_book_id: Uuid,
@@ -105,7 +104,7 @@ impl Default for Contact {
     }
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
+#[derive(Debug, Clone)]
 pub struct ContactGroup {
     pub id: Uuid,
     pub address_book_id: Uuid,