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/web/Dockerfile

@@ -18,9 +18,9 @@ COPY --from=deps /app/apps/web/node_modules ./apps/web/node_modules
 COPY . .
 ARG VITE_API_URL=
 ENV VITE_API_URL=$VITE_API_URL
-RUN pnpm --filter @ai-tycoon/shared build && \
-    pnpm --filter @ai-tycoon/game-engine build && \
-    pnpm --filter @ai-tycoon/web build
+RUN pnpm --filter @token-empire/shared build && \
+    pnpm --filter @token-empire/game-engine build && \
+    pnpm --filter @token-empire/web build
 
 FROM nginx:alpine
 COPY --from=build /app/apps/web/dist /usr/share/nginx/html