Add custom node published subgraphs endpoint (#10438)

* Add get_subgraphs_dir to ComfyExtension and PUBLISHED_SUBGRAPH_DIRS to nodes.py

* Created initial endpoints, although the returned paths are a bit off currently

* Fix path and actually return real data

* Sanitize returned /api/global_subgraphs entries

* Remove leftover function from early prototyping

* Remove added whitespace

* Add None check for sanitize_entry

server.py

@@ -35,6 +35,7 @@ from comfy_api.internal import _ComfyNodeInternal
 from app.user_manager import UserManager
 from app.model_manager import ModelFileManager
 from app.custom_node_manager import CustomNodeManager
+from app.subgraph_manager import SubgraphManager
 from typing import Optional, Union
 from api_server.routes.internal.internal_routes import InternalRoutes
 from protocol import BinaryEventTypes
@@ -173,6 +174,7 @@ class PromptServer():
         self.user_manager = UserManager()
         self.model_file_manager = ModelFileManager()
         self.custom_node_manager = CustomNodeManager()
+        self.subgraph_manager = SubgraphManager()
         self.internal_routes = InternalRoutes(self)
         self.supports = ["custom_nodes_from_web"]
         self.prompt_queue = execution.PromptQueue(self)
@@ -819,6 +821,7 @@ class PromptServer():
         self.user_manager.add_routes(self.routes)
         self.model_file_manager.add_routes(self.routes)
         self.custom_node_manager.add_routes(self.routes, self.app, nodes.LOADED_MODULE_DIRS.items())
+        self.subgraph_manager.add_routes(self.routes, nodes.LOADED_MODULE_DIRS.items())
         self.app.add_subapp('/internal', self.internal_routes.get_app())
 
         # Prefix every route with /api for easier matching for delegation.