Phase 25: division leaderboard, market trade history

- Market: record buy/sell history in market_history table; expose via
  GET /market/trade-history (last 30 events, newest first)
- Division: GET /division/leaderboard returns 10-club table with 9 seeded
  NPC entries + player row, sorted by pts; stable within a season
- rand feature small_rng enabled in Cargo.toml for SmallRng use
- 3 new integration tests (leaderboard count, sort order, empty trade history)
- Core: 96 tests passing

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/routes/market.rs

@@ -12,6 +12,13 @@ use crate::{
     services::{club as club_svc, market as market_svc, profile as profile_svc},
 };
 
+pub async fn get_trade_history(State(state): State<AppState>) -> AppResult<Json<Value>> {
+    let profile = profile_svc::get_active_profile(&state.pool).await?;
+    let club = club_svc::get_club_by_profile(&state.pool, &profile.id).await?;
+    let trades = market_svc::get_trade_history(&state.pool, &club.id).await?;
+    Ok(Json(json!({ "trades": trades, "total": trades.len() })))
+}
+
 
 #[derive(Deserialize)]
 pub struct MarketQuery {
@@ -63,7 +70,7 @@ pub async fn post_market_sell(
     let profile = profile_svc::get_active_profile(&state.pool).await?;
     let club = club_svc::get_club_by_profile(&state.pool, &profile.id).await?;
 
-    let new_balance = market_svc::sell_card(&state.pool, &club.id, &req).await?;
+    let new_balance = market_svc::sell_card(&state.pool, &state.card_db, &club.id, &req).await?;
     Ok(Json(
         json!({ "new_coin_balance": new_balance, "message": "Card sold to NPC market" }),
     ))