Refactor large files into modular components

- Refactored page.tsx (613→252 lines) with GameOverScreen and LeftPanel extracted
- Refactored StatsTab.tsx (584→92 lines) with section components
- Refactored SkillsTab.tsx (434→54 lines) with sub-components
- Created modular structure for GameContext, LootInventory, and other components
- All extracted components organized into feature directories

src/lib/game/data/golems/index.ts

@@ -0,0 +1,23 @@
+// ─── Golem Definitions Index ─────────────────────────────────
+// Re-exports from all golem modules
+
+// Re-export types
+export type { GolemDef, GolemManaCost } from './types';
+
+// Re-export data
+export { GOLEMS_DEF } from './data';
+
+// Re-export utility functions
+export {
+  getGolemSlots,
+  isGolemUnlocked,
+  getUnlockedGolems,
+  getGolemDamage,
+  getGolemAttackSpeed,
+  getGolemFloorDuration,
+  getGolemMaintenanceMultiplier,
+  canAffordGolemSummon,
+  deductGolemSummonCost,
+  canAffordGolemMaintenance,
+  deductGolemMaintenance,
+} from './utils';