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/achievements.rs

@@ -8,12 +8,19 @@ use crate::{
     services::{achievement as ach_svc, club as club_svc, profile as profile_svc},
 };
 
-pub async fn get_achievements(State(state): State<AppState>, game: GameId) -> AppResult<Json<Value>> {
+pub async fn get_achievements(
+    State(state): State<AppState>,
+    game: GameId,
+) -> AppResult<Json<Value>> {
     let profile = profile_svc::get_active_profile(&state.pool, game.as_str()).await?;
     let club = club_svc::get_club_by_profile(&state.pool, &profile.id).await?;
-    let _ = ach_svc::check_and_unlock(&state.pool, &state.achievement_defs, &profile.id, &club.id).await;
+    let _ = ach_svc::check_and_unlock(&state.pool, &state.achievement_defs, &profile.id, &club.id)
+        .await;
     let achievements = ach_svc::list_with_status(&state.pool, &state.achievement_defs).await?;
-    let earned = achievements.iter().filter(|a| a["unlocked"].as_bool().unwrap_or(false)).count();
+    let earned = achievements
+        .iter()
+        .filter(|a| a["unlocked"].as_bool().unwrap_or(false))
+        .count();
     Ok(Json(json!({
         "achievements": achievements,
         "earned": earned,