test(bailian): add suiteTeardown to restore default provider config

Prevents Bailian E2E settings from leaking into subsequent test suites.
Follows the same pattern as bedrock.test.ts suiteTeardown.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: F915

apps/vscode-e2e/src/suite/providers/bailian.test.ts

@@ -120,11 +120,21 @@ describe("Bailian Provider", function () {
 	/** @type {import("../../../src/extension/api").API} */
 	let api: any
 
+	/** @type {import("../../../src/extension/api").ProviderSettings} */
+	let originalConfig: any
+
 	before(async function () {
 		api = globalThis.api
 		if (!api) {
 			throw new Error("E2E API not found — ensure the test runner initializes globalThis.api")
 		}
+		originalConfig = await api.getConfiguration()
+	})
+
+	suiteTeardown(async function () {
+		if (originalConfig) {
+			await api.setConfiguration(originalConfig)
+		}
 	})
 
 	// -----------------------------------------------------------------------