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>

CHANGELOG.md

@@ -18,6 +18,7 @@ Status: unreleased.
 - Docs: add Render deployment guide. (#1975) Thanks @anurag.
 - Docs: add Claude Max API Proxy guide. (#1875) Thanks @atalovesyou.
 - Docs: add DigitalOcean deployment guide. (#1870) Thanks @0xJonHoldsCrypto.
+- Docs: add Oracle Cloud (OCI) platform guide + cross-links. (#2333) Thanks @hirefrank.
 - Docs: add Raspberry Pi install guide. (#1871) Thanks @0xJonHoldsCrypto.
 - Docs: add GCP Compute Engine deployment guide. (#1848) Thanks @hougangdev.
 - Docs: add LINE channel guide. Thanks @thewilloftheshadow.