chore(WEB): package-lock.json git 트래킹 제거

- .gitignore에 이미 등록되어 있으나 과거 커밋으로 트래킹 중이던 파일 제거

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/api/pdf/generate/route.ts

@@ -1,6 +1,5 @@
 import { NextRequest, NextResponse } from 'next/server';
-import puppeteer from 'puppeteer-core';
-import chromium from '@sparticuz/chromium';
+import puppeteer from 'puppeteer';
 
 /**
  * PDF 생성 API
@@ -36,20 +35,17 @@ export async function POST(request: NextRequest) {
       );
     }
 
-    // 로컬 개발 vs Vercel 환경 분기
-    const isVercel = process.env.VERCEL === '1';
+    // Puppeteer 브라우저 실행 (Docker Alpine에서는 시스템 Chromium 사용)
     const browser = await puppeteer.launch({
-      args: isVercel ? chromium.args : [
+      headless: true,
+      executablePath: process.env.PUPPETEER_EXECUTABLE_PATH || undefined,
+      args: [
         '--no-sandbox',
         '--disable-setuid-sandbox',
         '--disable-dev-shm-usage',
         '--disable-gpu',
         '--disable-software-rasterizer',
       ],
-      executablePath: isVercel
-        ? await chromium.executablePath()
-        : process.env.PUPPETEER_EXECUTABLE_PATH || '/usr/bin/google-chrome-stable',
-      headless: true,
     });
 
     const page = await browser.newPage();