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/routes/draft.rs

@@ -43,7 +43,8 @@ pub async fn post_draft_start(
 ) -> AppResult<Json<Value>> {
     let profile = profile_svc::get_active_profile(&state.pool).await?;
     let difficulty = query.difficulty.as_deref().unwrap_or("professional");
-    let session = draft_svc::start_draft(&state.pool, &state.card_db, &profile.id, difficulty).await?;
+    let session =
+        draft_svc::start_draft(&state.pool, &state.card_db, &profile.id, difficulty).await?;
     Ok(Json(session))
 }
 
@@ -53,7 +54,8 @@ pub async fn get_draft_session(
     Path(session_id): Path<String>,
 ) -> AppResult<Json<Value>> {
     let profile = profile_svc::get_active_profile(&state.pool).await?;
-    let session = draft_svc::get_draft(&state.pool, &state.card_db, &profile.id, &session_id).await?;
+    let session =
+        draft_svc::get_draft(&state.pool, &state.card_db, &profile.id, &session_id).await?;
     Ok(Json(session))
 }