优化Dockerfile，添加清理缓存和临时文件步骤。

Dockerfile

@@ -7,7 +7,9 @@ RUN pacman -Syu --noconfirm git cmake python nodejs && \
 
 FROM greyltc/archlinux-aur:yay AS runner
 WORKDIR /app
-RUN aur-install bun-bin wechat-bin
+RUN aur-install bun-bin wechat-bin && \
+    pacman -Scc --noconfirm && \
+    rm -rf /var/cache/makepkg/* /tmp/* /var/log/*
 COPY . .
 COPY --from=lib /src/wcocr/build/libwcocr.so .
 RUN bun install --frozen-lockfile

src/wcocr.ts

@@ -78,6 +78,5 @@ export class WechatOCRClient {
 
   public close() {
     WechatOCRFFI.symbols.stop_ocr()
-    console.log('OCR resources cleaned up.')
   }
 }