fix(providers): use correct endpoint for provider disconnect (#1714)

Fix #1462: handleDisconnectProvider called the SDK auth.remove() which
only clears auth credentials from auth.json. Cloud providers configured
in user/project/custom config files were not removed and reappeared
after reload. Now calls DELETE /api/provider/:id/auth?scope=all which
removes the provider from all config sources.

Co-authored-by: Leonid Skorobogatyy <bash@opencode.itc.local>

packages/ui/src/components/sections/providers/ProvidersPage.tsx

@@ -477,9 +477,14 @@ export const ProvidersPage: React.FC = () => {
     setAuthBusyKey(busyKey);
 
     try {
-      const result = await opencodeClient.getSdkClient().auth.remove({ providerID: providerId });
-      if (result.error) {
-        throw new Error(t('settings.providers.page.toast.providerDisconnectFailed'));
+      const response = await runtimeFetch(`/api/provider/${encodeURIComponent(providerId)}/auth?scope=all`, {
+        method: 'DELETE',
+        headers: { Accept: 'application/json' },
+      });
+
+      const payload = await response.json().catch(() => null);
+      if (!response.ok) {
+        throw new Error(payload?.error || t('settings.providers.page.toast.providerDisconnectFailed'));
       }
 
       toast.success(t('settings.providers.page.toast.providerDisconnected'));