⚡ optimize docs-tree API and fix CI lint errors

- Refactor `app/api/docs-tree/route.ts` to use asynchronous I/O and parallel processing.
- Fix ESLint `prefer-const` errors in `app/api/docs-tree/route.ts`.
- Remove unused `GitHub` import in `auth.config.ts`.
- Fix unused `error` variable in `scripts/check-pnpm-version.mjs`.

Co-authored-by: longsizhuo <114939201+longsizhuo@users.noreply.github.com>

Author: google-labs-jules[bot]

app/api/docs-tree/route.ts

@@ -110,7 +110,6 @@ export async function GET() {
     }
 
     // pick the first existing candidate
-    let docsRoot: string | undefined;
     const candidateChecks = await Promise.all(
       candidates.map(async (p) => {
         try {
@@ -121,7 +120,7 @@ export async function GET() {
         }
       }),
     );
-    docsRoot = candidateChecks.find((c) => c.exists)?.p;
+    const docsRoot = candidateChecks.find((c) => c.exists)?.p;
 
     if (!docsRoot) {
       return NextResponse.json(
@@ -140,9 +139,9 @@ export async function GET() {
     }
 
     // try to list
-    let tree: DirNode[] = [];
     try {
-      tree = await buildTree(docsRoot, 2);
+      const tree = await buildTree(docsRoot, 2);
+      return NextResponse.json({ ok: true, docsRoot, tree, diag });
     } catch (e: unknown) {
       const msg = e instanceof Error ? e.message : String(e);
       return NextResponse.json(
@@ -155,8 +154,6 @@ export async function GET() {
         { status: 500 },
       );
     }
-
-    return NextResponse.json({ ok: true, docsRoot, tree, diag });
   } catch (err: unknown) {
     const msg = err instanceof Error ? err.message : String(err);
     return NextResponse.json(

auth.config.ts

@@ -1,5 +1,4 @@
 import type { NextAuthConfig } from "next-auth";
-import GitHub from "next-auth/providers/github";
 
 // 在本地开发环境允许没有 .env 的协作者运行站点，因此先尝试读取两个常见的密钥变量，缺失时再使用内置的开发兜底值。
 const envSecret = process.env.AUTH_SECRET ?? process.env.NEXTAUTH_SECRET;

scripts/check-pnpm-version.mjs

@@ -54,7 +54,7 @@ try {
   let actualVersion;
   try {
     actualVersion = execSync('pnpm --version', { encoding: 'utf-8' }).trim();
-  } catch (error) {
+  } catch {
     console.error('❌ Error: pnpm is not installed or not found in PATH');
     console.error('\nTo fix this issue:');
     console.error('1. Enable corepack: corepack enable');