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/fut_champs.rs

@@ -26,7 +26,11 @@ pub async fn get_active_session(
     .map_err(Into::into)
 }
 
-pub async fn get_session(pool: &Pool, session_id: &str, profile_id: &str) -> AppResult<FutChampsSession> {
+pub async fn get_session(
+    pool: &Pool,
+    session_id: &str,
+    profile_id: &str,
+) -> AppResult<FutChampsSession> {
     sqlx::query_as::<_, FutChampsSession>(&format!(
         "{SESSION_SELECT} WHERE id = ? AND profile_id = ?"
     ))