wip(core): preserve local broad Core refactor + inventory service

Divergent development line off origin/main (11a811d): a broad refactor across
routes/services/models/app + a large integration_test expansion (+1000), plus an
untracked game-independent inventory query service and Docker files. Preserved
verbatim before moving the canonical Core checkout to the committed migration
trunk (66c88fb). Reconciling this refactor with the migration trunk is a separate
user decision; nothing here is lost.

src/services/profile.rs

@@ -86,7 +86,11 @@ pub async fn add_xp_with_levelup(
         }
 
         tracing::info!(profile_id, new_level = lvl, coins, "level up");
-        events.push(LevelUpEvent { new_level: lvl, coins_granted: coins, pack_granted: pack });
+        events.push(LevelUpEvent {
+            new_level: lvl,
+            coins_granted: coins,
+            pack_granted: pack,
+        });
     }
 
     Ok(events)