docs: update CHEATSHEET and README for new build/deploy commands

Replace AE_APP_BUILD_MODE=staging references and old docker compose
build-ui instructions with current build-docker-* and deploy-remote-*
Makefile targets.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CHEATSHEET.md

@@ -4,7 +4,8 @@
 - **Full Rebuild:** `docker compose up -d --build`
 - **Rebuild SvelteKit only:** `docker compose up -d --build ae_app`
 - **Restart API (pick up Python changes):** `docker compose restart ae_api`
-- **Switch Build Mode:** Edit `.env` → `AE_APP_BUILD_MODE=prod` → `docker compose up -d --build ae_app`
+- **Rebuild SvelteKit (local):** `make build-docker-dev` / `build-docker-test` / `build-docker-prod`
+- **Deploy to remote:** `make deploy-remote-test` / `deploy-remote-prod` (SSH → linode.oneskyit.com)
 - **Shut everything down:** `npm run compose:down` (from `aether_app_sveltekit/`)
 
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