feat: Hammer Dashboard with sidebar navigation (HQ-21)

- Add React Router with sidebar layout (DashboardLayout)
- Queue is now a routed page at /queue
- Chat placeholder page at /chat
- Admin page accessible from sidebar
- Dark sidebar with amber accent for active nav
- Updated CORS and auth to support dash.donovankelly.xyz
- Renamed to Hammer Dashboard

docker-compose.dokploy.yml

@@ -21,7 +21,7 @@ services:
       DATABASE_URL: postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@db:5432/${POSTGRES_DB}
       API_BEARER_TOKEN: ${API_BEARER_TOKEN}
       BETTER_AUTH_SECRET: ${BETTER_AUTH_SECRET}
-      BETTER_AUTH_URL: https://queue.donovankelly.xyz
+      BETTER_AUTH_URL: https://dash.donovankelly.xyz
       COOKIE_DOMAIN: .donovankelly.xyz
       CLAWDBOT_HOOK_URL: ${CLAWDBOT_HOOK_URL:-https://hooks.hammer.donovankelly.xyz/hooks/agent}
       CLAWDBOT_HOOK_TOKEN: ${CLAWDBOT_HOOK_TOKEN}