feat: the workspace at /workspace; Настройки show the assistant's model as set, key included, and PostgreSQL's fields only when chosen, its two buttons on one line; pages come in softly

internal/server/server.go

@@ -227,7 +227,8 @@ func (s *Server) Handler() http.Handler {
 
 	// Panel (admin-only).
 	mux.Handle("GET /{$}", s.requireAdmin(s.handleDashboard))
-	mux.Handle("GET /terminal", s.requireAdmin(s.handleShell))
+	mux.Handle("GET /workspace", s.requireAdmin(s.handleShell))
+	mux.Handle("GET /terminal", s.requireAdmin(s.handleShell)) // the old address
 	mux.Handle("GET /agents/{id}/terminal", s.requireAdmin(s.handleShell))
 	mux.Handle("GET /agents/{id}/{kind}", s.requireAdmin(s.handleShell)) // files
 	mux.Handle("GET /agents/{id}/forwards", s.requireAdmin(s.handleForwardsPage))