feat: implement find_all method in ChannelRepository and update related services and routes for public access

k-tv-backend/domain/src/services.rs

@@ -112,6 +112,10 @@ impl ChannelService {
             .ok_or(DomainError::ChannelNotFound(id))
     }
 
+    pub async fn find_all(&self) -> DomainResult<Vec<crate::entities::Channel>> {
+        self.channel_repo.find_all().await
+    }
+
     pub async fn find_by_owner(
         &self,
         owner_id: crate::value_objects::UserId,