feat: add secure passkey login for issue 536

go-backend/internal/store/model/passkey.go

@@ -0,0 +1,13 @@
+package model
+
+// Passkey stores a WebAuthn credential for exactly one panel user.
+type Passkey struct {
+	ID             string `gorm:"primaryKey;type:varchar(512)"`
+	UserID         int64  `gorm:"column:user_id;not null;index"`
+	Name           string `gorm:"type:varchar(100);not null"`
+	CredentialJSON string `gorm:"column:credential_json;type:text;not null"`
+	CreatedAt      int64  `gorm:"column:created_at;not null"`
+	LastUsedAt     int64  `gorm:"column:last_used_at;not null;default:0"`
+}
+
+func (Passkey) TableName() string { return "passkey" }