feat: add support for external server mode with Docker integration

- Introduced a new `docker-compose.dev-server.yml` for running the backend API in a container, enabling local Electron to connect to it.
- Updated `dev.mjs` to include a new option for launching the Docker server container.
- Enhanced the UI application to support external server mode, allowing session-based authentication and adjusting routing logic accordingly.
- Added utility functions to check and cache the external server mode status for improved performance.
- Updated various components to handle authentication and routing based on the server mode.

apps/ui/src/preload.ts

@@ -25,6 +25,9 @@ contextBridge.exposeInMainWorld('electronAPI', {
   // Get API key for authentication
   getApiKey: (): Promise<string | null> => ipcRenderer.invoke('auth:getApiKey'),
 
+  // Check if running in external server mode (Docker API)
+  isExternalServerMode: (): Promise<boolean> => ipcRenderer.invoke('auth:isExternalServerMode'),
+
   // Native dialogs - better UX than prompt()
   openDirectory: (): Promise<Electron.OpenDialogReturnValue> =>
     ipcRenderer.invoke('dialog:openDirectory'),