Tweak server/custom node load order

- Load custom nodes after creating server
 - Add routes after loading custom nodes
Custom nodes can now add routes via PromptServer.instance

main.py

@@ -40,6 +40,7 @@ if __name__ == "__main__":
     except:
         pass
 
+from nodes import init_custom_nodes
 import execution
 import server
 import folder_paths
@@ -98,6 +99,8 @@ if __name__ == "__main__":
     server = server.PromptServer(loop)
     q = execution.PromptQueue(server)
 
+    init_custom_nodes()
+    server.add_routes()
     hijack_progress(server)
 
     threading.Thread(target=prompt_worker, daemon=True, args=(q,server,)).start()
@@ -113,7 +116,6 @@ if __name__ == "__main__":
     except:
         address = '127.0.0.1'
 
-
     dont_print = False
     if '--dont-print-server' in sys.argv:
         dont_print = True

nodes.py

@@ -1050,6 +1050,6 @@ def load_custom_nodes():
         if os.path.isfile(module_path) and os.path.splitext(module_path)[1] != ".py": continue
         load_custom_node(module_path)
 
+def init_custom_nodes():
     load_custom_nodes()
-
     load_custom_node(os.path.join(os.path.join(os.path.dirname(os.path.realpath(__file__)), "comfy_extras"), "nodes_upscale_model.py"))

server.py

@@ -42,6 +42,7 @@ class PromptServer():
         self.web_root = os.path.join(os.path.dirname(
             os.path.realpath(__file__)), "web")
         routes = web.RouteTableDef()
+        self.routes = routes
         self.last_node_id = None
         self.client_id = None
 
@@ -240,7 +241,8 @@ class PromptServer():
 
             return web.Response(status=200)
         
-        self.app.add_routes(routes)
+    def add_routes(self):
+        self.app.add_routes(self.routes)
         self.app.add_routes([
             web.static('/', self.web_root),
         ])