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>

.gitea/workflows/ci.yml

@@ -6,7 +6,7 @@ on:
 
 env:
   REGISTRY: gitea.thewrightserver.net
-  IMAGE_PREFIX: gitea.thewrightserver.net/josh/aihostingtycoon
+  IMAGE_PREFIX: gitea.thewrightserver.net/josh/tokenempire
 
 jobs:
   build-and-push: