docs: update faq and install guidance

docs/platforms/linux.md

@@ -6,7 +6,8 @@ read_when:
 ---
 # Linux App
 
-The Gateway is fully supported on Linux. The core is written in TypeScript, so it runs anywhere Node or Bun runs.
+The Gateway is fully supported on Linux. **Node is the recommended runtime**.
+Bun is not recommended for the Gateway (WhatsApp/Telegram bugs).
 
 Native Linux companion apps are planned. Contributions are welcome if you want to help build one.
 
@@ -23,7 +24,7 @@ Step-by-step VPS guide: [exe.dev](/platforms/exe-dev)
 ## Install
 - [Getting Started](/start/getting-started)
 - [Install & updates](/install/updating)
-- Optional flows: [Bun](/install/bun), [Nix](/install/nix), [Docker](/install/docker)
+- Optional flows: [Bun (experimental)](/install/bun), [Nix](/install/nix), [Docker](/install/docker)
 
 ## Gateway
 - [Gateway runbook](/gateway)