feat: add VCard API integration with configuration and proxy endpoints

- Implemented VCard API controller with methods to manage configuration (save, get).
- Added proxy functions to handle API requests for users, vcards, memberships, payments, transactions, logs, and miniwebs.
- Included error handling and response formatting for API interactions.

pkg/models/vcard_api_config.go

@@ -0,0 +1,53 @@
+package models
+
+import (
+"github.com/sujit-baniya/fiber-boilerplate/app"
+"gorm.io/gorm"
+)
+
+// VcardApiConfig almacena las credenciales para conectar con la API Admin del
+// sistema VCard externo (Laravel + Sanctum, prefijo /api/admin/*).
+type VcardApiConfig struct {
+gorm.Model
+Nombre      string `json:"nombre"       gorm:"column:nombre;not null"`
+BaseURL     string `json:"base_url"     gorm:"column:base_url;type:text;not null"`
+BearerToken string `json:"bearer_token" gorm:"column:bearer_token;type:text;not null"`
+Activo      bool   `json:"activo"       gorm:"column:activo;default:true"`
+}
+
+func (VcardApiConfig) TableName() string { return "vcard_api_configs" }
+
+func GetVcardApiConfig() (*VcardApiConfig, error) {
+var cfg VcardApiConfig
+if err := app.Http.Database.DB.First(&cfg).Error; err != nil {
+return nil, err
+}
+return &cfg, nil
+}
+
+func UpsertVcardApiConfig(nombre, baseURL, bearerToken string, activo bool) (*VcardApiConfig, error) {
+var cfg VcardApiConfig
+err := app.Http.Database.DB.First(&cfg).Error
+if err != nil {
+cfg = VcardApiConfig{
+Nombre:      nombre,
+BaseURL:     baseURL,
+BearerToken: bearerToken,
+Activo:      activo,
+}
+if createErr := app.Http.Database.DB.Create(&cfg).Error; createErr != nil {
+return nil, createErr
+}
+return &cfg, nil
+}
+cfg.Nombre = nombre
+cfg.BaseURL = baseURL
+if bearerToken != "" {
+cfg.BearerToken = bearerToken
+}
+cfg.Activo = activo
+if err := app.Http.Database.DB.Save(&cfg).Error; err != nil {
+return nil, err
+}
+return &cfg, nil
+}