feat: rails style bootkit bin/railiance with quickstart

docs/first_host.md

@@ -0,0 +1,22 @@
+# First Railiance Host — Provider Guide
+
+## 1) Generate SSH key
+```
+bin/railiance gen-ssh-key
+```
+
+## 2) Choose a VM
+Ubuntu 24.04 LTS, 2 vCPU, 4–8GB RAM, 60+GB SSD, open 22/80/443.
+
+## 3) Cloud-init
+```
+bin/railiance cloudinit > user-data.yaml
+```
+
+## 4) Seed
+Copy Spore or clone directly, then run seed script on the host.
+
+## 5) Bootstrap (optional now)
+```
+ansible-playbook -i ansible/inventory/hosts.ini ansible/bootstrap.yml
+```