docs: add vps hosting hub

docs/vps.md

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+---
+summary: "VPS hosting hub for Clawdbot (Railway/Fly/Hetzner/exe.dev)"
+read_when:
+  - You want to run the Gateway in the cloud
+  - You need a quick map of VPS/hosting guides
+---
+# VPS hosting
+
+This hub links to the supported VPS/hosting guides and explains how cloud
+deployments work at a high level.
+
+## Pick a provider
+
+- **Railway** (one‑click + browser setup): [Railway](/railway)
+- **Fly.io**: [Fly.io](/platforms/fly)
+- **Hetzner (Docker)**: [Hetzner](/platforms/hetzner)
+- **exe.dev** (VM + HTTPS proxy): [exe.dev](/platforms/exe-dev)
+
+## How cloud setups work
+
+- The **Gateway runs on the VPS** and owns state + workspace.
+- You connect from your laptop/phone via the **Control UI** or **Tailscale/SSH**.
+- Treat the VPS as the source of truth and **back up** the state + workspace.
+
+Remote access: [Gateway remote](/gateway/remote)  
+Platforms hub: [Platforms](/platforms)
+
+## Using nodes with a VPS
+
+You can keep the Gateway in the cloud and pair **nodes** on your local devices
+(Mac/iOS/Android/headless). Nodes provide local screen/camera/canvas and `system.run`
+capabilities while the Gateway stays in the cloud.
+
+Docs: [Nodes](/nodes), [Nodes CLI](/cli/nodes)