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>

docs/architecture.md

@@ -17,7 +17,7 @@ The game engine and simulation core have no React dependency. They can run ident
 ## Monorepo Layout
 
 ```
-ai-tycoon/
+token-empire/
 ├── turbo.json                    # Turborepo task config
 ├── pnpm-workspace.yaml           # Workspace definition
 │
@@ -122,7 +122,7 @@ The store uses a slice pattern with 14 slices, each owning a portion of the game
 
 ### Persistence
 
-- **localStorage**: Auto-save every 60 ticks under key `ai-tycoon-save`. The Zustand `persist` middleware handles serialization.
+- **localStorage**: Auto-save every 60 ticks under key `token-empire-save`. The Zustand `persist` middleware handles serialization.
 - **Cloud saves**: Optional. POST to `/api/saves` every 5 minutes when authenticated. Requires the Hono backend + PostgreSQL.
 - **Save format versioning**: A `version` field in meta enables migration functions for breaking state changes.