Phase 20: achievement system

18 data-driven achievements (achievements.json) across 8 trigger categories:
matches_played, matches_won, goals_scored, packs_opened, sbcs_completed,
cards_owned, level, objectives_completed, drafts_completed. Rarities span
common → epic. Coin rewards range from 500 (first_match) to 6000 (win_50).

check_and_unlock() queries the relevant metric from existing tables, skips
already-earned achievements via INSERT OR IGNORE, grants coin rewards, and
fires a persistent notification per unlock. Trigger values are cached per
call to avoid redundant DB round-trips for same-trigger achievements.

Checks run automatically after every match result (all triggers), every
pack open (packs_opened), and every successful SBC submission (sbcs_completed).

GET /achievements returns all definitions annotated with unlocked/unlocked_at,
plus earned and total counts. POST /matches/result response gains an
achievements_unlocked array (empty when nothing new unlocked).

AppState gains achievement_defs (Arc<Vec<AchievementDefinition>>) loaded
from data/achievements/**/*.json at startup — same pattern as obj_defs.

5 new tests: list endpoint, first_match unlock, first_win unlock, no-dup
guard, coin reward verification. Core now at 82 tests.

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

src/routes/achievements.rs

@@ -0,0 +1,21 @@
+use axum::{extract::State, Json};
+use serde_json::{json, Value};
+
+use crate::{
+    app::AppState,
+    error::AppResult,
+    services::{achievement as ach_svc, club as club_svc, profile as profile_svc},
+};
+
+pub async fn get_achievements(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 _ = 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();
+    Ok(Json(json!({
+        "achievements": achievements,
+        "earned": earned,
+        "total": achievements.len(),
+    })))
+}