Skip OAuth registration for sx docs app

sx is a public documentation site like test — no auth needed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/infrastructure/factory.py

@@ -145,8 +145,8 @@ def create_base_app(
     errors(app)
 
     # Auto-register OAuth client blueprint for non-account apps
-    # (account is the OAuth authorization server; test is a public dashboard)
-    _NO_OAUTH = {"account", "test"}
+    # (account is the OAuth authorization server; test/sx are public dashboards)
+    _NO_OAUTH = {"account", "test", "sx"}
     if name not in _NO_OAUTH:
         from shared.infrastructure.oauth import create_oauth_blueprint
         app.register_blueprint(create_oauth_blueprint(name))