feat: add utility functions and helpers

- Add JWT token generation and validation utilities
- Add password hashing with bcrypt for secure authentication
- Add pagination helper for API responses
- Add random string generation for tokens and IDs
- Add session management utilities
- Add admin user initialization functionality

utils/pagination.go

@@ -0,0 +1,46 @@
+package utils
+
+import (
+	"fmt"
+	"math"
+
+	"github.com/gofiber/fiber/v2"
+)
+
+func Pagination(c *fiber.Ctx, total int64, page int, limit int) (*fiber.Map, *fiber.Map) {
+	totalPages := int(math.Ceil(float64(total) / float64(limit)))
+	paginationInformation := fiber.Map{
+		"page":        page,
+		"limit":       limit,
+		"total":       total,
+		"total_pages": totalPages,
+	}
+
+	paginationLinks := fiber.Map{
+		"self": fiber.Map{
+			"href": fmt.Sprintf("%s?page=%d&limit=%d", c.Path(), page, limit),
+		},
+		"first": fiber.Map{
+			"href": fmt.Sprintf("%s?page=1&limit=%d", c.Path(), limit),
+		},
+		"last": fiber.Map{
+			"href": fmt.Sprintf("%s?page=%d&limit=%d", c.Path(), totalPages, limit),
+		},
+		"next": nil,
+		"prev": nil,
+	}
+
+	if page > 1 {
+		paginationLinks["prev"] = fiber.Map{
+			"href": fmt.Sprintf("%s?page=%d&limit=%d", c.Path(), page-1, limit),
+		}
+	}
+
+	if page < totalPages {
+		paginationLinks["next"] = fiber.Map{
+			"href": fmt.Sprintf("%s?page=%d&limit=%d", c.Path(), page+1, limit),
+		}
+	}
+
+	return &paginationInformation, &paginationLinks
+}