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.

open-sse/services/tokenRefresh.js

@@ -6,7 +6,6 @@ import {
   refreshKimiToken,
   refreshClaudeOAuthToken,
   refreshGoogleToken,
-  refreshQwenToken,
   refreshCodexToken,
   refreshKiroToken,
   refreshIflowToken,
@@ -26,7 +25,6 @@ export {
   refreshKimiToken,
   refreshClaudeOAuthToken,
   refreshGoogleToken,
-  refreshQwenToken,
   refreshCodexToken,
   refreshKiroToken,
   refreshIflowToken,
@@ -137,7 +135,6 @@ const REFRESH_HANDLERS = {
   antigravity: (c, log) => refreshGoogleToken(c.refreshToken, PROVIDERS.antigravity.clientId, PROVIDERS.antigravity.clientSecret, log),
   claude: (c, log) => refreshClaudeOAuthToken(c.refreshToken, log),
   codex: (c, log) => refreshCodexToken(c.refreshToken, log),
-  qwen: (c, log) => refreshQwenToken(c.refreshToken, log),
   iflow: (c, log) => refreshIflowToken(c.refreshToken, log),
   github: (c, log) => refreshGitHubToken(c.refreshToken, log),
   kiro: (c, log) => refreshKiroToken(c.refreshToken, c.providerSpecificData, log),
@@ -205,7 +202,6 @@ export function formatProviderCredentials(provider, credentials, log) {
       };
 
     case "codex":
-    case "qwen":
     case "iflow":
     case "openai":
     case "openrouter":