feat: password auth

internal/validation/password.go

@@ -0,0 +1,15 @@
+package validation
+
+import "errors"
+
+func ValidatePassword(password string) error {
+	if password == "" {
+		return errors.New("password is required")
+	}
+
+	if len(password) < 12 {
+		return errors.New("password must be at least 12 characters")
+	}
+
+	return nil
+}