feat: add Go models for User and UserProfile

- Create models/user.go with bcrypt password hashing
- Create models/user_profile.go with foreign key relationship
- Add GORM hooks for automatic profile creation
- Include proper JSON tags and database constraints

models/user.go

@@ -0,0 +1,40 @@
+package models
+
+import (
+	"golang.org/x/crypto/bcrypt"
+	"gorm.io/gorm"
+)
+
+type User struct {
+	ID       uint   `gorm:"primaryKey" json:"id"`
+	Username string `gorm:"unique;not null;size:80" json:"username"`
+	Email    string `gorm:"unique;not null;size:255" json:"email"` // Add this line
+	Password string `gorm:"not null;size:255" json:"-"`
+
+	Profile *UserProfile `gorm:"constraint:OnDelete:CASCADE;" json:"profile,omitempty"`
+}
+
+func (u *User) SetPassword(password string) error {
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return err
+	}
+	u.Password = string(hashedPassword)
+	return nil
+}
+
+func (u *User) CheckPassword(password string) bool {
+	err := bcrypt.CompareHashAndPassword([]byte(u.Password), []byte(password))
+	return err == nil
+}
+
+func (u *User) AfterCreate(tx *gorm.DB) error {
+	profile := UserProfile{
+		UserID:         u.ID,
+		FirstName:      "",
+		LastName:       "",
+		Bio:            "",
+		ProfilePicture: "",
+	}
+	return tx.Create(&profile).Error
+}