adding favorite feature

src/application/ports/favorites_ports.rs

@@ -0,0 +1,19 @@
+use async_trait::async_trait;
+use crate::common::errors::Result;
+use crate::application::dtos::favorites_dto::FavoriteItemDto;
+
+/// Defines operations for managing user favorites
+#[async_trait]
+pub trait FavoritesUseCase: Send + Sync {
+    /// Get all favorites for a user
+    async fn get_favorites(&self, user_id: &str) -> Result<Vec<FavoriteItemDto>>;
+    
+    /// Add an item to user's favorites
+    async fn add_to_favorites(&self, user_id: &str, item_id: &str, item_type: &str) -> Result<()>;
+    
+    /// Remove an item from user's favorites
+    async fn remove_from_favorites(&self, user_id: &str, item_id: &str, item_type: &str) -> Result<bool>;
+    
+    /// Check if an item is in user's favorites
+    async fn is_favorite(&self, user_id: &str, item_id: &str, item_type: &str) -> Result<bool>;
+}

src/application/ports/mod.rs

@@ -4,4 +4,5 @@ pub mod file_ports;
 pub mod storage_ports;
 pub mod auth_ports;
 pub mod trash_ports;
-pub mod share_ports;
+pub mod share_ports;
+pub mod favorites_ports;