style: apply cargo fmt to entire codebase

Standardize code formatting across all 173 Rust source files
using rustfmt. No functional changes - purely cosmetic.

This establishes a consistent code style baseline for the
project going forward.

src/application/ports/favorites_ports.rs

@@ -1,19 +1,24 @@
-use async_trait::async_trait;
-use crate::common::errors::Result;
 use crate::application::dtos::favorites_dto::FavoriteItemDto;
+use crate::common::errors::Result;
+use async_trait::async_trait;
 
 /// 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>;
-    
+    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>;
 }
@@ -40,4 +45,4 @@ pub trait FavoritesRepositoryPort: Send + Sync + 'static {
 
     /// Checks if an item is in favorites.
     async fn is_favorite(&self, user_id: &str, item_id: &str, item_type: &str) -> Result<bool>;
-}
+}