style(core): apply cargo fmt across routes, services, models, tests

Pure rustfmt reflow (import grouping, array/match-arm/call-arg wrapping,
alphabetized module decls, comment realignment). No semantic change:
full-diff and `git diff -w` both confirm logic byte-identical to 271c363;
workspace builds and all 74 core tests pass. Retained pre-existing WIP
brought forward after verification.

src/routes/draft.rs

@@ -45,7 +45,8 @@ pub async fn post_draft_start(
 ) -> AppResult<Json<Value>> {
     let profile = profile_svc::get_active_profile(&state.pool, game.as_str()).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))
 }
 
@@ -56,7 +57,8 @@ pub async fn get_draft_session(
     Path(session_id): Path<String>,
 ) -> AppResult<Json<Value>> {
     let profile = profile_svc::get_active_profile(&state.pool, game.as_str()).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))
 }