feat(providers): add TokenRouter provider

OpenAI-compatible gateway exposing 300+ models (OpenAI, Claude, Gemini,
Qwen, DeepSeek, Kimi, GLM, and more). Registered as p116, append-only.

open-sse/providers/registry/index.js

@@ -116,6 +116,7 @@ import p113 from "./morph.js";
 // import p114 from "./devin-cli.js";
 // import p104 from "./windsurf.js";
 import p115 from "./poolside.js";
+import p116 from "./tokenrouter.js";
 
 export default [
   p0,
@@ -233,4 +234,5 @@ export default [
   // p114, // devin-cli — hidden, spawns local agent with shell/fs access
   // p104, // windsurf — hidden, no tool calling
   p115,
+  p116,
 ];