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>

apps/server/tsconfig.json

@@ -1,5 +1,5 @@
 {
-  "extends": "@ai-tycoon/tsconfig/node.json",
+  "extends": "@token-empire/tsconfig/node.json",
   "compilerOptions": {
     "outDir": "dist",
     "rootDir": "src"