docs(host-agent): correct stale Windows entries — host agent now runs on Windows

The prior commit in this PR added two Windows entries to HOST-AGENT-API.md
based on the docs state at the time the sync was drafted. Windows host
agent support shipped via the fix/windows-host-agent-startup branch
before this PR's work began, so the 'not yet available' row and the
'dream.ps1 restart' workaround blockquote describe out-of-date behavior.

Replaces the table row with the accurate mechanism and removes the
workaround blockquote.

Author: yasinBursali

dream-server/docs/HOST-AGENT-API.md

@@ -12,12 +12,10 @@ The Dashboard API runs inside a Docker container and cannot directly run `docker
 |----------|-----------|
 | Linux | systemd user service (`scripts/systemd/dream-host-agent.service`) |
 | macOS | Started by the installer (`installers/macos/install-macos.sh`) |
-| Windows | Not yet available — host agent is not installed on Windows |
+| Windows | Started by the installer (`installers/windows/phases/07-devtools.ps1`, managed via `dream.ps1`) |
 
 The agent is started during installation (phase 07 on Linux) and binds to `127.0.0.1` only — it is not accessible from the network.
 
-> **Windows note:** Because the host agent is not installed on Windows, the Dashboard API cannot start or stop extension containers in-dashboard. To apply extension changes on Windows, run `.\dream.ps1 restart` from your install directory after enabling or disabling an extension.
-
 ## Configuration
 
 The agent reads its configuration from the `.env` file in the DreamServer install directory.