feat(cli): add flag in HttpConfig for auth on custom routes (#6193)

We currently only support auth on the default routes; we'd like to be
able to support it on all (non-meta/liveness probe) routes by default.
This is the first step in that direction.

libs/cli/langgraph_cli/config.py

@@ -371,6 +371,14 @@ class HttpConfig(TypedDict, total=False):
 
     Default is `middleware_first`.
     """
+    enable_custom_route_auth: bool
+    """Optional. If True, authentication is enabled for custom routes,
+    not just the routes that are protected by default.
+    (Routes protected by default include /assistants, /threads, and /runs).
+
+    Default is False. This flag only affects authentication behavior
+    if `app` is provided and contains custom routes.
+    """
 
 
 class Config(TypedDict, total=False):

libs/cli/schemas/schema.json

@@ -577,6 +577,10 @@
           "type": "boolean",
           "description": "Optional. If True, /threads routes are removed.\n\nDefault is False.\n"
         },
+        "enable_custom_route_auth": {
+          "type": "boolean",
+          "description": "Optional. If True, authentication is enabled for custom routes,\nnot just the routes that are protected by default.\n(Routes protected by default include /assistants, /threads, and /runs).\n\nDefault is False. This flag only affects authentication behavior\nif `app` is provided and contains custom routes.\n"
+        },
         "logging_headers": {
           "anyOf": [
             {

libs/cli/schemas/schema.v0.json

@@ -577,6 +577,10 @@
           "type": "boolean",
           "description": "Optional. If True, /threads routes are removed.\n\nDefault is False.\n"
         },
+        "enable_custom_route_auth": {
+          "type": "boolean",
+          "description": "Optional. If True, authentication is enabled for custom routes,\nnot just the routes that are protected by default.\n(Routes protected by default include /assistants, /threads, and /runs).\n\nDefault is False. This flag only affects authentication behavior\nif `app` is provided and contains custom routes.\n"
+        },
         "logging_headers": {
           "anyOf": [
             {