Task 1: Implement 5-tier talent tree structure

- Rewrite skill definitions with 5-tier Continuous Talent Tree
- Add perk choices at Level 5 and Level 10 for each tier
- Add Elite Perks at T3 L10 and T5 L10
- Remove scrollCrafting (violates NO INSTANT FINISHING pillar)
- Set max:1 for skills that don't need evolution paths
- All 512 tests passing

src/lib/game/stores/__tests__/store-methods.test.ts

@@ -4,7 +4,7 @@
  * Tests for individual store methods: skillStore, manaStore, combatStore, prestigeStore
  */
 
-import { describe, it, expect, beforeEach } from 'bun:test';
+import { describe, it, expect, beforeEach } from 'vitest';
 import { useSkillStore } from '../skillStore';
 import { useManaStore } from '../manaStore';
 import { useCombatStore } from '../combatStore';

src/lib/game/stores/__tests__/stores.test.ts

@@ -5,7 +5,7 @@
  * Each store is tested individually and for cross-store communication.
  */
 
-import { describe, it, expect, beforeEach } from 'bun:test';
+import { describe, it, expect, beforeEach } from 'vitest';
 import {
   fmt,
   fmtDec,

src/lib/game/stores/index.test.ts

@@ -5,7 +5,7 @@
  * Updated for the new skill system with tiers and upgrade trees.
  */
 
-import { describe, it, expect, beforeEach } from 'bun:test';
+import { describe, it, expect, beforeEach } from 'vitest';
 import {
   computeMaxMana,
   computeElementMax,