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/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@ai-tycoon/game-engine",
+  "name": "@token-empire/game-engine",
   "private": true,
   "version": "0.0.1",
   "type": "module",
@@ -11,10 +11,10 @@
     "test": "vitest run"
   },
   "dependencies": {
-    "@ai-tycoon/shared": "workspace:*"
+    "@token-empire/shared": "workspace:*"
   },
   "devDependencies": {
-    "@ai-tycoon/tsconfig": "workspace:*",
+    "@token-empire/tsconfig": "workspace:*",
     "typescript": "^5.8.0"
   }
 }