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/services/upgrades.rs

@@ -16,14 +16,12 @@ pub const MAX_TRAINING_BONUS: i64 = 3;
 pub const POSITION_CHANGE_COST: i64 = 500;
 
 async fn fetch_owned(pool: &Pool, owned_card_id: &str, club_id: &str) -> AppResult<OwnedCard> {
-    sqlx::query_as::<_, OwnedCard>(&format!(
-        "{OWNED_CARD_SELECT} WHERE id = ? AND club_id = ?"
-    ))
-    .bind(owned_card_id)
-    .bind(club_id)
-    .fetch_optional(pool)
-    .await?
-    .ok_or_else(|| AppError::NotFound("owned card not found".into()))
+    sqlx::query_as::<_, OwnedCard>(&format!("{OWNED_CARD_SELECT} WHERE id = ? AND club_id = ?"))
+        .bind(owned_card_id)
+        .bind(club_id)
+        .fetch_optional(pool)
+        .await?
+        .ok_or_else(|| AppError::NotFound("owned card not found".into()))
 }
 
 /// Apply a chemistry style to an owned card.
@@ -64,8 +62,8 @@ pub async fn change_position(
     new_position: &str,
 ) -> AppResult<OwnedCard> {
     let valid_positions = [
-        "GK", "RB", "LB", "CB", "RWB", "LWB", "CDM", "CM", "CAM", "RM", "LM", "RW", "LW",
-        "CF", "ST",
+        "GK", "RB", "LB", "CB", "RWB", "LWB", "CDM", "CM", "CAM", "RM", "LM", "RW", "LW", "CF",
+        "ST",
     ];
     if !valid_positions.contains(&new_position) {
         return Err(AppError::BadRequest(format!(