feat: add business logic controllers

- Add authentication controller for login, logout, and token refresh
- Add user controller for user management and profile operations
- Add session controller for session management and validation
- Add access controller for API access control and permissions
- Include proper input validation and error handling
- Implement secure authentication flows

controllers/user.go

@@ -0,0 +1,20 @@
+package controllers
+
+import (
+	"git.secnex.io/secnex/idp-api/api"
+	"git.secnex.io/secnex/idp-api/repositories"
+	"github.com/gofiber/fiber/v2"
+	"gorm.io/gorm"
+)
+
+func GetUsers(c *fiber.Ctx) error {
+	db := c.Locals("db").(*gorm.DB)
+	userRepo := repositories.NewUserRepository(db)
+	users, err := userRepo.GetAllUsers()
+	if err != nil {
+		return api.Error(c, "Failed to get users", fiber.StatusInternalServerError, fiber.Map{
+			"message": "Failed to get users",
+		})
+	}
+	return api.Success(c, users, fiber.StatusOK, nil, nil)
+}