fix(providers): remove Qwen provider support

Qwen OAuth flow (portal.qwen.ai) stopped working reliably; drop the
executor, registry entry, OAuth provider/service, token refresh
profile, usage handler, and related test coverage and baselines.

src/app/api/providers/[id]/test/testUtils.js

@@ -12,7 +12,6 @@ import {
   GEMINI_CONFIG,
   ANTIGRAVITY_CONFIG,
   KIRO_CONFIG,
-  QWEN_CONFIG,
   CLAUDE_CONFIG,
   CLINE_CONFIG,
   KILOCODE_CONFIG,
@@ -62,7 +61,6 @@ const OAUTH_TEST_CONFIG = {
     method: "GET",
     noAuth: true,
   },
-  qwen: { checkExpiry: true, refreshable: true },
   kiro: { checkExpiry: true, refreshable: true },
   qoder: {
     // Test by hitting Qoder's userinfo endpoint with the device token.
@@ -285,21 +283,6 @@ async function refreshOAuthToken(connection) {
       return { accessToken: data.accessToken, expiresIn: data.expiresIn || 3600, refreshToken: data.refreshToken || refreshToken };
     }
 
-    if (provider === "qwen") {
-      const response = await fetch(QWEN_CONFIG.tokenUrl, {
-        method: "POST",
-        headers: { "Content-Type": "application/x-www-form-urlencoded", "Accept": "application/json" },
-        body: new URLSearchParams({
-          grant_type: "refresh_token",
-          refresh_token: refreshToken,
-          client_id: QWEN_CONFIG.clientId,
-        }),
-      });
-      if (!response.ok) return null;
-      const data = await response.json();
-      return { accessToken: data.access_token, expiresIn: data.expires_in, refreshToken: data.refresh_token || refreshToken };
-    }
-
     if (provider === "cline") {
       const response = await fetch(CLINE_CONFIG.refreshUrl, {
         method: "POST",