fix: ia controller usa endpoint default si no hay config en BD + valida status HTTP de Ollama

rest/controllers/api/ia_controller.go

@@ -33,11 +33,12 @@ func GeneraTextoStream(c *fiber.Ctx) error {
 
 	config, err := models.GetAiConfigForService("ia")
 	if err != nil {
-		return c.Status(fiber.StatusServiceUnavailable).JSON(fiber.Map{
-			"error": "No hay configuración de IA activa. Configura una en /app/ai-config",
-		})
+		config = &models.AiConfig{
+			BaseURL:   "http://72.60.24.97:8080/ollama",
+			ApiKey:    "",
+			ModelName: "gemma3:1b",
+		}
 	}
-
 	if data.Model == "" {
 		data.Model = config.ModelName
 	}
@@ -45,7 +46,6 @@ func GeneraTextoStream(c *fiber.Ctx) error {
 		data.Model = "gemma3:1b"
 	}
 
-	// Usar endpoint nativo de Ollama (/api/generate), no OpenAI compat (/v1/...)
 	baseURL := strings.TrimSuffix(strings.TrimRight(config.BaseURL, "/"), "/v1")
 	endpoint := baseURL + "/api/generate"
 
@@ -55,7 +55,6 @@ func GeneraTextoStream(c *fiber.Ctx) error {
 		return err
 	}
 	req.Header.Set("Content-Type", "application/json")
-	// Sin auth para red interna; api_key como token para URL pública
 	if config.ApiKey != "" && config.ApiKey != "ollama" {
 		req.SetBasicAuth("ollama", config.ApiKey)
 	}
@@ -65,6 +64,12 @@ func GeneraTextoStream(c *fiber.Ctx) error {
 	if err != nil {
 		return c.Status(fiber.StatusBadGateway).JSON(fiber.Map{"error": err.Error()})
 	}
+	if resp.StatusCode != http.StatusOK {
+		resp.Body.Close()
+		return c.Status(fiber.StatusBadGateway).JSON(fiber.Map{
+			"error": fmt.Sprintf("Ollama respondió con status %d", resp.StatusCode),
+		})
+	}
 
 	c.Set("Content-Type", "text/plain; charset=utf-8")
 	c.Set("Cache-Control", "no-cache")
@@ -73,6 +78,7 @@ func GeneraTextoStream(c *fiber.Ctx) error {
 	c.Context().SetBodyStreamWriter(func(w *bufio.Writer) {
 		defer resp.Body.Close()
 		scanner := bufio.NewScanner(resp.Body)
+		scanner.Buffer(make([]byte, 0, 64*1024), 1024*1024)
 		for scanner.Scan() {
 			line := scanner.Bytes()
 			if len(line) == 0 {