fix: preserve all-time stats, achievements, and boss first-kill across prestige (#47)

Resolves #37, resolves #38, and resolves #39 — three related bugs where prestige incorrectly reset data that should survive all prestige resets.

## Changes

### fix: preserve lifetime player stats across prestige (#37)
After prestige, `GameState.player.lifetime*` fields were stale — they reflected values from *before* the current run. The Prisma Player record was incremented correctly, but the GameState JSON saved to the DB had old values, so the UI showed wrong all-time totals on reload.

`buildPostPrestigeState` now computes the run-stat contributions (bosses defeated, quests completed, adventurers recruited, achievements unlocked, gold earned, clicks) and folds them into the fresh player object before writing the prestige state.

### fix: preserve achievements across prestige (#38)
`buildPostPrestigeState` was reconstructing achievements from `defaultAchievements` (via `initialGameState`), resetting all unlocked achievements on every prestige. Achievements are now carried forward from `currentState.achievements` instead.

### fix: preserve boss first-kill state across prestige (#39)
Added `bountyRunestonesClaimed?: boolean` to the `Boss` type. The boss challenge route now:
- Only awards the first-kill bounty runestones if `bountyRunestonesClaimed !== true`
- Sets `bountyRunestonesClaimed = true` on first defeat

`buildPostPrestigeState` maps the fresh boss list and carries the `bountyRunestonesClaimed` flag forward from the current state, so the bounty is never re-awarded in subsequent prestige runs. The boss panel badge is also hidden for bosses whose bounty is already claimed.

## Test Coverage
All three fixes include new tests covering the new behaviours. API coverage remains at 100%.

✨ This PR was created with help from Hikari~ 🌸

Reviewed-on: #47
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

apps/api/test/services/prestige.spec.ts

@@ -13,14 +13,24 @@ import {
 } from "../../src/services/prestige.js";
 import type { GameState } from "@elysium/types";
 
-const makePlayer = (totalGoldEarned: number) => ({
-  discordId: "test_id",
-  username: "testuser",
-  discriminator: "0",
-  avatar: null,
-  totalGoldEarned,
-  totalClicks: 0,
-  characterName: "Tester",
+const makePlayer = (
+  totalGoldEarned: number,
+  lifetimeGoldEarned = 0,
+  totalClicks = 0,
+) => ({
+  avatar:                       null,
+  characterName:                "Tester",
+  discordId:                    "test_id",
+  discriminator:                "0",
+  lifetimeAchievementsUnlocked: 0,
+  lifetimeAdventurersRecruited: 0,
+  lifetimeBossesDefeated:       0,
+  lifetimeClicks:               0,
+  lifetimeGoldEarned:           lifetimeGoldEarned,
+  lifetimeQuestsCompleted:      0,
+  totalClicks:                  totalClicks,
+  totalGoldEarned:              totalGoldEarned,
+  username:                     "testuser",
 });
 
 const makeMinimalState = (overrides: Partial<GameState> = {}): GameState =>
@@ -242,4 +252,126 @@ describe("buildPostPrestigeState", () => {
     const { prestigeState } = buildPostPrestigeState(state, "Tester");
     expect(prestigeState.apotheosis).toEqual(apotheosis);
   });
+
+  it("accumulates current-run gold into lifetime total", () => {
+    const state = makeMinimalState({
+      player: makePlayer(4_000_000, 1_000_000),
+    });
+    const { prestigeState } = buildPostPrestigeState(state, "Tester");
+    expect(prestigeState.player.lifetimeGoldEarned).toBe(5_000_000);
+  });
+
+  it("accumulates current-run clicks into lifetime total", () => {
+    const state = makeMinimalState({
+      player: makePlayer(4_000_000, 0, 500),
+    });
+    const { prestigeState } = buildPostPrestigeState(state, "Tester");
+    expect(prestigeState.player.lifetimeClicks).toBe(500);
+  });
+
+  it("accumulates defeated bosses into lifetime total", () => {
+    const defeatedBoss = {
+      bountyRunestones:    0,
+      crystalReward:       0,
+      currentHp:           0,
+      damagePerSecond:     10,
+      description:         "A boss",
+      equipmentRewards:    [] as string[],
+      essenceReward:       0,
+      goldReward:          100,
+      id:                  "boss_1",
+      maxHp:               100,
+      name:                "Boss One",
+      prestigeRequirement: 0,
+      status:              "defeated" as const,
+      upgradeRewards:      [] as string[],
+      zoneId:              "zone_1",
+    };
+    const state = makeMinimalState({ bosses: [ defeatedBoss ] });
+    const { prestigeState } = buildPostPrestigeState(state, "Tester");
+    expect(prestigeState.player.lifetimeBossesDefeated).toBe(1);
+  });
+
+  it("preserves bountyRunestonesClaimed flag on bosses across prestige", () => {
+    const claimedBoss = {
+      bountyRunestones:        5,
+      bountyRunestonesClaimed: true,
+      crystalReward:           0,
+      currentHp:               0,
+      damagePerSecond:         10,
+      description:             "A boss",
+      equipmentRewards:        [] as string[],
+      essenceReward:           0,
+      goldReward:              100,
+      id:                      "troll_king",
+      maxHp:                   100,
+      name:                    "Troll King",
+      prestigeRequirement:     0,
+      status:                  "defeated" as const,
+      upgradeRewards:          [] as string[],
+      zoneId:                  "verdant_vale",
+    };
+    const state = makeMinimalState({ bosses: [ claimedBoss ] as GameState["bosses"] });
+    const { prestigeState } = buildPostPrestigeState(state, "Tester");
+    const matchingBoss = prestigeState.bosses.find((boss) => {
+      return boss.id === "troll_king";
+    });
+    expect(matchingBoss?.bountyRunestonesClaimed).toBe(true);
+  });
+
+  it("accumulates completed quests into lifetime total", () => {
+    const quest = {
+      id:          "q_1",
+      name:        "A Quest",
+      description: "Do the thing",
+      status:      "completed" as const,
+      zoneId:      "zone_1",
+    };
+    const state = makeMinimalState({ quests: [ quest ] as GameState["quests"] });
+    const { prestigeState } = buildPostPrestigeState(state, "Tester");
+    expect(prestigeState.player.lifetimeQuestsCompleted).toBe(1);
+  });
+
+  it("accumulates recruited adventurers into lifetime total", () => {
+    const adventurer = {
+      combatPower:       10,
+      count:             5,
+      essencePerSecond:  0,
+      goldPerSecond:     1,
+      id:                "adv_1",
+      level:             1,
+      unlocked:          true,
+    };
+    const state = makeMinimalState({ adventurers: [ adventurer ] as GameState["adventurers"] });
+    const { prestigeState } = buildPostPrestigeState(state, "Tester");
+    expect(prestigeState.player.lifetimeAdventurersRecruited).toBe(5);
+  });
+
+  it("preserves achievements from current state across prestige", () => {
+    const achievement = {
+      description: "Did a thing",
+      id:          "ach_persisted",
+      name:        "Achiever",
+      requirement: 1,
+      type:        "totalClicks" as const,
+      unlockedAt:  Date.now(),
+    };
+    const state = makeMinimalState({ achievements: [ achievement ] as GameState["achievements"] });
+    const { prestigeState } = buildPostPrestigeState(state, "Tester");
+    expect(prestigeState.achievements).toEqual([ achievement ]);
+  });
+
+  it("accumulates unlocked achievements into lifetime total", () => {
+    const achievement = {
+      description: "Did a thing",
+      id:          "ach_1",
+      name:        "Achiever",
+      requirement: 1,
+      type:        "totalClicks" as const,
+      unlockedAt:  Date.now(),
+    };
+    const state = makeMinimalState({ achievements: [ achievement ] as GameState["achievements"] });
+    const { prestigeState } = buildPostPrestigeState(state, "Tester");
+    expect(prestigeState.player.lifetimeAchievementsUnlocked).toBe(1);
+  });
 });