v0.331.0: OnlyOffice opens and saves from FileBrowser and Nextcloud; FileBrowser back at once after a restart (R-1018)

FileBrowser config carries server.internalUrl http://filebrowser:80 (OnlyOffice fetched the public files address and got 403);
Nextcloud's DocumentServerInternalUrl gets its trailing slash (every save was lost: http://onlyoffice:80cache/...);
RestartStack("filebrowser") runs the R-1126 gate at once (files.<domain> was 502 for up to 5 min after the link switched).
Each red-proofed. MinAgent 0.158.1.

controller/internal/stacks/manager.go

@@ -1501,6 +1501,15 @@ func (m *Manager) RestartStack(name string) error {
 	}
 	m.mu.Unlock()
 
+	// R-1018: a re-created FileBrowser starts off traefik-public (R-1126), so files.<domain> answered 502 until the next
+	// base-stack round — up to 5 minutes, measured 4 min 8 s on demo-hp 2026-10-18 after the OnlyOffice link switched
+	// on (its Apply and Revoke restart FileBrowser). Check and publish this run now, in the background like the mounts
+	// sync does (handlers.go): the check may wait ~20 s for FileBrowser to answer, and it takes infraMu, which no caller
+	// of RestartStack holds. Pinned by TestRestartStack_R1018_FileBrowserPublishedAgainAtOnce.
+	if name == fileBrowserContainer {
+		go m.EnsureFileBrowserGate()
+	}
+
 	return m.RefreshStatus()
 }