docs: Add portal project to ecosystem documentation (#5300)

Co-authored-by: Copilot <[email protected]>

Author: hosenur

packages/web/src/content/docs/ecosystem.mdx

@@ -30,6 +30,7 @@ You can also check out [awesome-opencode](https://github.com/awesome-opencode/aw
 | ------------------------------------------------------------- | ---------------------------------------------------------- |
 | [kimaki](https://github.com/remorses/kimaki)                  | Discord bot to control OpenCode sessions, built on the SDK |
 | [opencode.nvim](https://github.com/NickvanDyke/opencode.nvim) | Neovim plugin for editor-aware prompts, built on the API   |
+| [portal](https://github.com/hosenur/portal)                   | Mobile-first web UI for OpenCode over Tailscale/VPN        |
 
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