feat: optimize Dockerfile for HuggingFace Spaces deployment

Dockerfile

@@ -15,8 +15,9 @@ ENV NODE_OPTIONS="--max_old_space_size=2048" \
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
     tzdata git curl && \
-    ln -s /usr/share/zoneinfo/UTC /etc/localtime && \
-    echo UTC > /etc/timezone
+    rm -f /etc/localtime && \
+    ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && \
+    echo $TZ > /etc/timezone
 
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 # Web builder stage - optimized