Fix Python scoping issue: rename html variable to avoid conflict

The variable 'html' was being assigned to store HTML content, which
caused Python to treat 'html' as a local variable throughout the
function. This prevented access to the 'html' module (imported at
the top) within f-strings that referenced html.escape().

Renamed the HTML content variable to 'html_content' to avoid the
naming conflict with the html module.

internal/model/oidc_key_model.go

@@ -0,0 +1,13 @@
+package model
+
+type OIDCKey struct {
+	ID         int    `gorm:"column:id;primaryKey;autoIncrement"`
+	PrivateKey string `gorm:"column:private_key;not null"`
+	CreatedAt  int64  `gorm:"column:created_at"`
+	UpdatedAt  int64  `gorm:"column:updated_at"`
+}
+
+func (OIDCKey) TableName() string {
+	return "oidc_keys"
+}
+