Add user registration with password hashing and restructure handlers directory

internal/services/userService.go

@@ -1 +1,18 @@
 package services
+
+import (
+	"CatsOfMastodonBotGo/internal/models"
+	"gorm.io/gorm"
+)
+
+type UserService struct {
+	db *gorm.DB
+}
+
+func NewUserService(db *gorm.DB) *UserService {
+	return &UserService{db: db}
+}
+
+func (us *UserService) CreateUser(user models.ComUser) int {
+	return int(us.db.Create(&user).RowsAffected)
+}