Update Dockerfile

Dockerfile

@@ -26,7 +26,7 @@ RUN pip install --no-cache-dir \
 ENV HF_HOME=/tmp/hf_cache
 RUN python3 -c "\
 from huggingface_hub import snapshot_download; \
-snapshot_download('Qwen/Qwen3-0.6B', cache_dir='/tmp/hf_cache')"
+snapshot_download('Qwen/Qwen2.5-0.5B-Instruct', cache_dir='/tmp/hf_cache')"
 
 # ── Copy app ──
 WORKDIR /app