[feat] add support for self-hosted server configuration

src/gui/windows/main_window.cpp

@@ -0,0 +1,49 @@
+#include "localization.h"
+#include "rd_log.h"
+#include "render.h"
+
+int Render::MainWindow() {
+  ImGui::SetNextWindowPos(ImVec2(0, title_bar_height_), ImGuiCond_Always);
+  ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0.0f, 0.0f));
+  ImGui::PushStyleColor(ImGuiCol_ChildBg, ImVec4(1.0f, 1.0f, 1.0f, 1.0f));
+  ImGui::BeginChild("DeskWindow",
+                    ImVec2(main_window_width_default_, local_window_height_),
+                    ImGuiChildFlags_Border,
+                    ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoCollapse |
+                        ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoTitleBar |
+                        ImGuiWindowFlags_NoBringToFrontOnFocus);
+  ImGui::PopStyleVar();
+  ImGui::PopStyleColor();
+
+  LocalWindow();
+
+  ImDrawList* draw_list = ImGui::GetWindowDrawList();
+  draw_list->AddLine(
+      ImVec2(main_window_width_default_ / 2, title_bar_height_ + 15.0f),
+      ImVec2(main_window_width_default_ / 2, title_bar_height_ + 225.0f),
+      IM_COL32(0, 0, 0, 122), 1.0f);
+
+  RemoteWindow();
+  ImGui::EndChild();
+
+  RecentConnectionsWindow();
+  StatusBar();
+
+  if (show_connection_status_window_) {
+    for (auto it = client_properties_.begin();
+         it != client_properties_.end();) {
+      auto& props = it->second;
+      if (focused_remote_id_ == props->remote_id_) {
+        if (ConnectionStatusWindow(props)) {
+          it = client_properties_.erase(it);
+        } else {
+          ++it;
+        }
+      } else {
+        ++it;
+      }
+    }
+  }
+
+  return 0;
+}