add internal /folder_paths route (#4980)

returns a json maps of folder paths

api_server/routes/internal/internal_routes.py

@@ -1,6 +1,6 @@
 from aiohttp import web
 from typing import Optional
-from folder_paths import models_dir, user_directory, output_directory
+from folder_paths import models_dir, user_directory, output_directory, folder_names_and_paths
 from api_server.services.file_service import FileService
 import app.logger
 
@@ -36,6 +36,13 @@ class InternalRoutes:
         async def get_logs(request):
             return web.json_response(app.logger.get_logs())
 
+        @self.routes.get('/folder_paths')
+        async def get_folder_paths(request):
+            response = {}
+            for key in folder_names_and_paths:
+                response[key] = folder_names_and_paths[key][0]
+            return web.json_response(response)
+
     def get_app(self):
         if self._app is None:
             self._app = web.Application()