fix(thinking): fix auth matching for thinking suffix and json field conflicts

sdk/cliproxy/auth/conductor.go

@@ -1711,6 +1711,13 @@ func (m *Manager) pickNext(ctx context.Context, provider, model string, opts cli
 	}
 	candidates := make([]*Auth, 0, len(m.auths))
 	modelKey := strings.TrimSpace(model)
+	// Always use base model name (without thinking suffix) for auth matching.
+	if modelKey != "" {
+		parsed := thinking.ParseSuffix(modelKey)
+		if parsed.ModelName != "" {
+			modelKey = strings.TrimSpace(parsed.ModelName)
+		}
+	}
 	registryRef := registry.GetGlobalRegistry()
 	for _, candidate := range m.auths {
 		if candidate.Provider != provider || candidate.Disabled {