fix(providers): remove the duplicate qwen provider

qwen.js points at the same transport as alims-intl — identical baseUrl
(dashscope-intl compatible-mode), headers, and quirks — but carries only 8
Qwen models against alims-intl's broader catalog, so it adds nothing a user
could not already reach. Node count is back to 81.

The id was dropped on 2026-08-05 (dcdd4628b) when the Qwen OAuth flow died;
this removes the standalone API-key entry that shadowed it. The `qw` alias
returns to unassigned, its state before today.

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

open-sse/providers/registry/index.js

@@ -123,7 +123,6 @@ import p119 from "./selfhosted-embedding.js";
 import p120 from "./fish-audio.js";
 import p121 from "./alitp-intl.js";
 import p122 from "./xquik.js";
-import p124 from "./qwen.js";
 export default [
   p0,
   p1,
@@ -247,5 +246,4 @@ export default [
   p120,
   p121,
   p122,
-  p124,
 ];