feat(ai-config): agregar botón Probar para verificar conectividad del provider

- Endpoint GET /ai-config/:id/test que llama /api/tags (Ollama) o /v1/models (OpenAI-compat/Anthropic)
- Botón "Probar" en cada fila de la tabla con modal de resultado JSON

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

rest/controllers/ai_config_controller.go

@@ -1,9 +1,12 @@
 package controllers
 
 import (
+	"encoding/json"
 	"math"
+	"net/http"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/gofiber/fiber/v2"
 	"github.com/sujit-baniya/fiber-boilerplate/pkg/models"
@@ -164,6 +167,81 @@ func GetAiConfigSelect(c *fiber.Ctx) error {
 	return c.JSON(fiber.Map{"registros": items})
 }
 
+// TestAiConfigHandler verifica conectividad con el provider de la config.
+func TestAiConfigHandler(c *fiber.Ctx) error {
+	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
+	if err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "id inválido"})
+	}
+	var item models.AiConfig
+	if err := models.GetAiConfigByID(uint(id), &item); err != nil {
+		return c.Status(fiber.StatusNotFound).JSON(fiber.Map{"error": "config no encontrada"})
+	}
+
+	client := &http.Client{Timeout: 10 * time.Second}
+
+	var testURL string
+	var req *http.Request
+
+	switch item.Provider {
+	case "ollama":
+		base := strings.TrimSuffix(strings.TrimRight(item.BaseURL, "/"), "/v1")
+		testURL = base + "/api/tags"
+		req, _ = http.NewRequest("GET", testURL, nil)
+		if item.ApiKey != "" && item.ApiKey != "ollama" {
+			req.SetBasicAuth("ollama", item.ApiKey)
+		}
+	case "anthropic":
+		// Anthropic no tiene /models; usamos /v1/models igual (devuelve 200 con lista)
+		base := item.BaseURL
+		if base == "" {
+			base = "https://api.anthropic.com/v1"
+		}
+		testURL = base + "/models"
+		req, _ = http.NewRequest("GET", testURL, nil)
+		req.Header.Set("x-api-key", item.ApiKey)
+		req.Header.Set("anthropic-version", "2023-06-01")
+	default:
+		base := item.BaseURL
+		if base == "" {
+			switch item.Provider {
+			case "openai":
+				base = "https://api.openai.com/v1"
+			case "qwen":
+				base = "https://dashscope.aliyuncs.com/compatible-mode/v1"
+			case "groq":
+				base = "https://api.groq.com/openai/v1"
+			default:
+				return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "BaseURL requerida para este provider"})
+			}
+		}
+		testURL = base + "/models"
+		req, _ = http.NewRequest("GET", testURL, nil)
+		req.Header.Set("Authorization", "Bearer "+item.ApiKey)
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return c.JSON(fiber.Map{"ok": false, "error": err.Error()})
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode >= 400 {
+		var body map[string]interface{}
+		json.NewDecoder(resp.Body).Decode(&body)
+		return c.JSON(fiber.Map{"ok": false, "status": resp.StatusCode, "error": body})
+	}
+
+	// Para Ollama devolvemos la lista de modelos disponibles
+	if item.Provider == "ollama" {
+		var body map[string]interface{}
+		json.NewDecoder(resp.Body).Decode(&body)
+		return c.JSON(fiber.Map{"ok": true, "status": resp.StatusCode, "data": body})
+	}
+
+	return c.JSON(fiber.Map{"ok": true, "status": resp.StatusCode})
+}
+
 // DeleteAiConfigHandler elimina una configuración de IA.
 func DeleteAiConfigHandler(c *fiber.Ctx) error {
 	id, err := strconv.ParseUint(c.Params("id"), 10, 64)