feat: enhance document import functionality and runtime configuration

- Added support for watching local folders in the EmbeddedImportMenu, including a new FolderSync icon.
- Introduced onFolderWatched callback to handle folder watch success.
- Updated runtime configuration hooks to allow optional access outside the RuntimeConfigProvider.
- Improved error handling in ZeroProvider for unauthorized access scenarios.
- Refactored base API service to manage desktop authentication more effectively.

surfsense_web/components/providers/runtime-config.tsx

@@ -31,6 +31,11 @@ export function useRuntimeConfig() {
 	return context;
 }
 
+/** For components that may render outside RuntimeConfigProvider (e.g. anonymous /free pages). */
+export function useOptionalRuntimeConfig(): RuntimeConfigValue | null {
+	return useContext(RuntimeConfigContext);
+}
+
 export function useIsLocalAuth() {
 	return useRuntimeConfig().authType === "LOCAL";
 }