fix: preserve lifetime player stats across prestige

Fixes #37. After prestige, the GameState's player.lifetime* fields were
stale — they did not include the current run's contributions. The Prisma
Player record was updated correctly, but the saved GameState had old values,
so the UI showed stale all-time totals on reload.

buildPostPrestigeState now computes run-stat contributions and folds them
into the fresh player object before writing the prestige state, ensuring
the GameState is always consistent with the DB Player record.

apps/api/src/services/prestige.ts

@@ -205,10 +205,51 @@ const buildPostPrestigeState = (
   };
 
   const freshState = initialGameState(currentState.player, characterName);
+
+  // Compute current-run contributions to accumulate into lifetime totals
+  const runBossesDefeated = currentState.bosses.filter((boss) => {
+    return boss.status === "defeated";
+  }).length;
+  const runQuestsCompleted = currentState.quests.filter((quest) => {
+    return quest.status === "completed";
+  }).length;
+  let runAdventurersRecruited = 0;
+  for (const adventurer of currentState.adventurers) {
+    runAdventurersRecruited = runAdventurersRecruited + adventurer.count;
+  }
+  const runAchievementsUnlocked = currentState.achievements.filter(
+    (achievement) => {
+      return achievement.unlockedAt !== null;
+    },
+  ).length;
+
   const prestigeState: GameState = {
     ...freshState,
     lastTickAt: Date.now(),
-    prestige:   prestigeData,
+
+    /*
+     * Fold current-run totals into lifetime stats so the GameState reflects
+     * the true all-time values immediately after prestige.
+     */
+    player: {
+      ...freshState.player,
+      lifetimeAchievementsUnlocked:
+        freshState.player.lifetimeAchievementsUnlocked
+        + runAchievementsUnlocked,
+      lifetimeAdventurersRecruited:
+        freshState.player.lifetimeAdventurersRecruited
+        + runAdventurersRecruited,
+      lifetimeBossesDefeated:
+        freshState.player.lifetimeBossesDefeated + runBossesDefeated,
+      lifetimeClicks:
+        freshState.player.lifetimeClicks + currentState.player.totalClicks,
+      lifetimeGoldEarned:
+        freshState.player.lifetimeGoldEarned
+        + currentState.player.totalGoldEarned,
+      lifetimeQuestsCompleted:
+        freshState.player.lifetimeQuestsCompleted + runQuestsCompleted,
+    },
+    prestige: prestigeData,
     // Codex lore persists across prestiges — players keep their discovered entries
     ...currentState.codex === undefined
       ? {}