feat: support OpenWebUI as Ollama gateway

- Connect via OpenWebUI API at https://llm.reifonas.cloud/api
- Use /api/v1/chat/completions format for OpenWebUI
- Keep native Ollama format as fallback
- Auto-detect models from both endpoints

services/apiTestService.ts

@@ -66,8 +66,12 @@ const testOllama = async (endpoint?: string): Promise<TestResult> => {
     }
   }
   
+  // Normalize endpoint - add /api for OpenWebUI
+  const useOpenWebUI = ollamaEndpoint.includes('llm.reifonas.cloud');
+  const apiEndpoint = useOpenWebUI ? `${ollamaEndpoint}/api` : ollamaEndpoint;
+  
   try {
-    const response = await fetch(`${ollamaEndpoint}/api/tags`);
+    const response = await fetch(`${apiEndpoint}/tags`);
     
     if (!response.ok) {
       return { success: false, error: 'Não foi possível conectar ao Ollama. Verifique o endereço.' };