Rename AI Tycoon to Token Empire across entire codebase

Full rebrand: UI display text, package scope (@ai-tycoon/* -> @token-empire/*),
localStorage keys, Docker/CI image paths, database names, and documentation.

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

packages/game-engine/src/systems/achievementSystem.test.ts

@@ -1,7 +1,7 @@
 import { describe, it, expect } from 'vitest';
 import { processAchievements } from './achievementSystem';
 import { createTestState } from '../__test-utils__';
-import type { AchievementDefinition } from '@ai-tycoon/shared';
+import type { AchievementDefinition } from '@token-empire/shared';
 
 function makeDef(overrides: Partial<AchievementDefinition> = {}): AchievementDefinition {
   return {