docs: Add Oracle Cloud (OCI) platform guide (#2333)

* docs: Add Oracle Cloud (OCI) platform guide

- Add comprehensive guide for Oracle Cloud Always Free tier (ARM)
- Cover VCN security, Tailscale Serve setup, and why traditional hardening is unnecessary
- Update vps.md to list Oracle as top provider option
- Update digitalocean.md to link to official Oracle guide instead of community gist

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Keep community gist link, remove unzip

* Fix step order: lock down VCN after Tailscale is running

* Move VCN lockdown to final step (after verifying everything works)

* docs: make Oracle/Tailscale guide safer + tone down DO copy

* docs: fix Oracle guide step numbering

* docs: tone down VPS hub Oracle blurb

* docs: add Oracle Cloud guide (#2333) (thanks @hirefrank)

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Pocket Clawd <pocket@Pockets-Mac-mini.local>

docs/vps.md

@@ -1,5 +1,5 @@
 ---
-summary: "VPS hosting hub for Clawdbot (Fly/Hetzner/GCP/exe.dev)"
+summary: "VPS hosting hub for Clawdbot (Oracle/Fly/Hetzner/GCP/exe.dev)"
 read_when:
   - You want to run the Gateway in the cloud
   - You need a quick map of VPS/hosting guides
@@ -11,6 +11,7 @@ deployments work at a high level.
 
 ## Pick a provider
 
+- **Oracle Cloud (Always Free)**: [Oracle](/platforms/oracle) — $0/month (Always Free, ARM; capacity/signup can be finicky)
 - **Fly.io**: [Fly.io](/platforms/fly)
 - **Hetzner (Docker)**: [Hetzner](/platforms/hetzner)
 - **GCP (Compute Engine)**: [GCP](/platforms/gcp)