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>

README.md

@@ -1,4 +1,4 @@
-# AI Tycoon
+# Token Empire
 
 A browser-based incremental/idle game where you manage an AI company from a garage startup to building AGI. Navigate the real tensions of the AI industry: scaling compute, training frontier models, balancing safety vs capability, hiring talent, and competing with rival labs.
 
@@ -29,7 +29,7 @@ The web app starts at `http://localhost:5173` (or the next available port). The
 ## Project Structure
 
 ```
-ai-tycoon/
+token-empire/
 ├── apps/
 │   ├── web/              # React frontend (Vite)
 │   └── server/           # Hono API backend
@@ -81,7 +81,7 @@ pnpm clean        # Clean build artifacts
 The backend requires PostgreSQL for cloud saves and leaderboards. Set the connection string in `apps/server/.env`:
 
 ```
-DATABASE_URL=postgresql://user:password@localhost:5432/ai_tycoon
+DATABASE_URL=postgresql://user:password@localhost:5432/token_empire
 ```
 
 Run migrations: