Implement Single Sign-On (SSO) Feature: Add SSO settings page, integrate OIDC provider registration dialog, and update dependencies for better-auth to version 1.4.18. Enhance user interface with new SSO menu item and improve database schema for SSO providers.

packages/server/src/db/schema/account.ts

@@ -203,3 +203,21 @@ export const apikeyRelations = relations(apikey, ({ one }) => ({
 		references: [user.id],
 	}),
 }));
+
+export const ssoProvider = pgTable("sso_provider", {
+	id: text("id").primaryKey(),
+	issuer: text("issuer").notNull(),
+	oidcConfig: text("oidc_config"),
+	samlConfig: text("saml_config"),
+	userId: text("user_id").references(() => user.id, { onDelete: "cascade" }),
+	providerId: text("provider_id").notNull().unique(),
+	organizationId: text("organization_id"),
+	domain: text("domain").notNull(),
+});
+
+export const ssoProviderRelations = relations(ssoProvider, ({ one }) => ({
+	user: one(user, {
+		fields: [ssoProvider.userId],
+		references: [user.id],
+	}),
+}));