chore: disable overzealous promise lint rules (#2665)

Disable `promise/avoid-new` and `promise/prefer-await-to-callbacks`
which produce false positives in frontend codebases where `new Promise()`
and callback-style APIs are unavoidable. Remove now-unnecessary
suppress comment in error-test page.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: devmgn

oxlint.config.ts

@@ -101,6 +101,10 @@ export default defineConfig({
     "oxc/no-optional-chaining": "off",
     "oxc/no-rest-spread-properties": "off",
 
+    // ── eslint-plugin-promise (built-in) ──
+    "promise/avoid-new": "off",
+    "promise/prefer-await-to-callbacks": "off",
+
     // ── eslint-plugin-react (built-in) ──
     "react/jsx-filename-extension": ["error", { extensions: [".tsx"] }],
     "react/jsx-max-depth": "off",

src/app/(sandbox)/error-test/page.tsx

@@ -18,7 +18,6 @@ export default function ErrorTestPage() {
 
     try {
       // 実際のAPI呼び出しをシミュレート
-      // oxlint-disable-next-line promise/avoid-new
       await new Promise((resolve) => {
         setTimeout(resolve, 1000);
       });