#12123: docs: add dedicated hardware guide (Jetson, Pi, mini PCs)

## What Adds a new documentation page covering how to run OpenClaw on dedicated hardware devices — an alternative to cloud VPS hosting. ## Changes - **New page**: `docs/install/hardware.md` — covers NVIDIA Jetson Orin Nano, Raspberry Pi 5, and x86 mini PCs with setup instructions, tips (SSD, systemd, remote access, browser automation), and a hardware vs. cloud comparison table - **Sidebar**: Added to Install → Hosting and deployment group (first item, since it's the simplest option) - **VPS hub**: Added a "Dedicated hardware" section linking to the new page ## Why There's currently no documentation for running OpenClaw on physical/dedicated devices. The VPS page covers cloud providers, and the install page covers package managers, but there's a gap for people who want an always-on local setup on a Jetson, Pi, or mini PC. This is a common setup in the community (especially for privacy and cost reasons). Also mentions [ClawBox](https://openclawhardware.dev) as a pre-built turnkey option for users who don't want to assemble their own hardware. <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR adds a new Mintlify docs page (`docs/install/hardware.md`) describing how to run OpenClaw on dedicated hardware (Jetson Orin Nano, Raspberry Pi 5, and x86 mini PCs), updates the Install sidebar navigation (`docs/docs.json`) to include the new page under “Hosting and deployment”, and adds a link from the VPS hub (`docs/vps.md`) to the new dedicated hardware guide. <h3>Confidence Score: 5/5</h3> - This PR is safe to merge with minimal risk. - Changes are documentation-only (new page + navigation link) and don’t affect runtime code paths. Links and navigation entries appear consistent with existing Mintlify patterns in the repo. - No files require special attention <!-- greptile_other_comments_section --> _{(2/5) Greptile learns from your feedback when you react with thumbs up/down!} <!-- /greptile_comment -->