chore:Docker MNG에 나눔 한글 폰트 추가 (DOCX→PDF 한글 깨짐 해결)

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

sam/docker/mng/Dockerfile

@@ -13,8 +13,10 @@ RUN apt-get update && apt-get install -y \
     nginx \
     supervisor \
     libreoffice-writer-nogui \
+    fonts-nanum fonts-nanum-extra \
     && docker-php-ext-configure gd --with-freetype --with-jpeg \
-    && docker-php-ext-install zip mysqli pdo pdo_mysql intl soap gd
+    && docker-php-ext-install zip mysqli pdo pdo_mysql intl soap gd \
+    && fc-cache -f
 
 # Composer 설치
 COPY --from=composer:2 /usr/bin/composer /usr/bin/composer