feat(deploy): aibook.fun deploy layer (terraform + ansible + docker on DO)

deploy/README.md

@@ -0,0 +1,25 @@
+# Deploy
+
+Provisions a DO droplet + reserved IP + firewall + monitoring, builds the
+Next.js image locally on the droplet, runs it behind Caddy.
+
+## Deploy from scratch
+
+```bash
+cd terraform
+infisical login
+export INFISICAL_PROJECT_ID=<aibook-fun-project-id>
+./itofu.sh init && ./itofu.sh plan && ./itofu.sh apply
+./itofu.sh output -raw droplet_ip
+
+# add Cloudflare A record: aibook.fun → <that-ip>
+
+cd ..
+ansible-playbook -i 'root@<that-ip>,' ansible/deploy.yml
+```
+
+## Structure
+
+- `terraform/` — droplet + IP + firewall + monitoring
+- `docker/` — Dockerfile + compose + Caddy
+- `ansible/` — droplet convergence