[code] improve structure (focus: server)

crates/lanspread-db/src/db.rs

@@ -1,7 +1,7 @@
 #![allow(clippy::missing_errors_doc)]
 #![allow(clippy::doc_markdown)]
 
-use std::{collections::HashMap, fmt};
+use std::{collections::HashMap, fmt, path::Path};
 
 use bytes::Bytes;
 use serde::{Deserialize, Serialize};
@@ -93,6 +93,17 @@ impl GameDB {
         db
     }
 
+    pub fn add_thumbnails(&mut self, thumbs_dir: &Path) {
+        for game in self.games.values_mut() {
+            let asset = thumbs_dir.join(format!("{}.jpg", game.id));
+            if let Ok(data) = std::fs::read(&asset) {
+                game.thumbnail = Some(Bytes::from(data));
+            } else {
+                tracing::warn!("Thumbnail missing: {}", game.id);
+            }
+        }
+    }
+
     #[must_use]
     pub fn get_game_by_id<S>(&self, id: S) -> Option<&Game>
     where