更新 Dockerfile：build 時將 fonts/ 安裝至系統字體目錄

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

Dockerfile

@@ -13,6 +13,12 @@ RUN npm ci --omit=dev
 
 COPY . .
 
+RUN if [ -d fonts ] && ls fonts/*.{ttf,otf,ttc} 2>/dev/null | grep -q .; then \
+      mkdir -p /usr/local/share/fonts/custom && \
+      cp fonts/*.ttf fonts/*.otf fonts/*.ttc /usr/local/share/fonts/custom/ 2>/dev/null || true && \
+      fc-cache -f; \
+    fi
+
 ENV NODE_ENV=production
 ENV PORT=3000
 ENV TEMPLATE_DIR=/app/templates