feat(e2e): 核心全链路用例与辅助模块

新增 smoke-http、core-full-chain（访客深链守卫、登录黄金路径、可选健康 URL）；抽出 music-room-session 辅助；Playwright 忽略本地 admin_debug；CI 注入可选 MOICEN_HEALTHCHECK_URL。

Made-with: Cursor

playwright.config.ts

@@ -6,6 +6,7 @@ loadEnv({ path: path.join(__dirname, '.env.e2e') });
 
 export default defineConfig({
   testDir: './tests',
+  testIgnore: ['**/admin_debug.spec.ts'],
   timeout: 120_000,
   workers: 1,
   expect: { timeout: 30_000 },