fix(langgraph): 将预下载 Whisper 模型复制到 appuser 缓存目录

cfc-langgraph/Dockerfile

@@ -20,6 +20,9 @@ RUN python3 -c "from faster_whisper import WhisperModel; WhisperModel('base', de
     chmod -R u+rwX /root/.cache || true
 
 RUN useradd -m -u 1000 appuser && \
+    mkdir -p /home/appuser/.cache && \
+    cp -a /root/.cache/. /home/appuser/.cache/ && \
+    chown -R appuser:appuser /home/appuser && \
     chown -R appuser:appuser /app && \
     mkdir -p /data/chroma_db && \
     chown -R appuser:appuser /data