#10195: docs: add Hostinger installation guide

## Summary - Add new Hostinger VPS platform documentation with UI-based Docker Manager setup - Update cost comparison tables across all VPS platform guides to include Hostinger - Add cross-references to Hostinger guide in related documentation ## Details **New file:** - `docs/install/hostinger.md` — Complete setup guide for Hostinger VPS using their Docker Manager UI and pre-configured OpenClaw catalog entry **Updated files:** - `docs/platforms/index.md` — Added Hostinger to VPS & hosting list - `docs/vps.md` — Added Hostinger to provider list - `docs/docs.json` — Added Hostinger to navigation <!-- greptile_comment --> <h2>Greptile Overview</h2> <h3>Greptile Summary</h3> This PR adds a new Hostinger VPS install guide (`docs/install/hostinger.md`), wires it into the Mintlify navigation (`docs/docs.json`), and cross-links it from the Platforms and VPS hub pages. Key issues to address before merge: - The Platforms page Hostinger entry currently has a malformed Markdown link, so the new cross-reference won’t be clickable. - The Hostinger guide instructs direct public access to the Control UI via `IP:PORT` but doesn’t include the project’s usual secure-default guidance (loopback + SSH/Tailscale; require token/password + firewalling if exposed). <h3>Confidence Score: 3/5</h3> - This PR is mostly safe to merge after fixing a broken docs link and aligning Hostinger access guidance with existing security defaults. - Changes are documentation-only and localized, but they currently include (1) a definite broken internal link and (2) guidance that can lead users to unintentionally expose the Control UI publicly, which conflicts with existing VPS docs. - docs/platforms/index.md, docs/install/hostinger.md <!-- greptile_other_comments_section --> _{(4/5) You can add custom instructions or style guidelines for the agent [here](https://app.greptile.com/review/github)!} <!-- /greptile_comment -->