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/Dockerfile

@@ -14,8 +14,8 @@ COPY --from=deps /app/node_modules ./node_modules
 COPY --from=deps /app/packages/shared/node_modules ./packages/shared/node_modules
 COPY --from=deps /app/apps/server/node_modules ./apps/server/node_modules
 COPY . .
-RUN pnpm --filter @ai-tycoon/shared build && \
-    pnpm --filter @ai-tycoon/server typecheck
+RUN pnpm --filter @token-empire/shared build && \
+    pnpm --filter @token-empire/server typecheck
 
 FROM base AS production
 COPY pnpm-lock.yaml pnpm-workspace.yaml package.json ./