feat: Dockerfile.hf single container for HuggingFace Spaces deployment

Dockerfile.hf

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+FROM python:3.11-slim
+
+WORKDIR /app
+
+# Install system deps
+RUN apt-get update && apt-get install -y \
+    wget curl tar python3-venv \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy frontend static files
+COPY index.html app.js services.css ./
+
+# Copy backend
+COPY deepshell-backend/ ./deepshell-backend/
+
+# Install DeepShell Python deps
+RUN pip install --no-cache-dir -r deepshell-backend/requirements.txt && \
+    pip install --no-cache-dir httpx && \
+    pip install --no-cache-dir -e deepshell-backend/
+
+# Install LibreTranslate in separate venv
+RUN python3 -m venv /opt/venvs/libretranslate && \
+    /opt/venvs/libretranslate/bin/pip install --no-cache-dir libretranslate==1.9.5
+
+# Pre-download LibreTranslate language models
+RUN /opt/venvs/libretranslate/bin/libretranslate --load-only en,hi --update-files || true
+
+# Download Piper binary
+RUN wget -q https://github.com/rhasspy/piper/releases/download/2023.11.14-2/piper_linux_x86_64.tar.gz \
+    && tar -xzf piper_linux_x86_64.tar.gz \
+    && rm piper_linux_x86_64.tar.gz \
+    && mv piper /opt/piper
+
+# Download Hindi voice model
+RUN mkdir -p /opt/piper/voices && \
+    wget -q https://huggingface.co/rhasspy/piper-voices/resolve/main/hi/hi_IN/rohan/medium/hi_IN-rohan-medium.onnx \
+        -O /opt/piper/voices/hi_IN-rohan-medium.onnx && \
+    wget -q https://huggingface.co/rhasspy/piper-voices/resolve/main/hi/hi_IN/rohan/medium/hi_IN-rohan-medium.onnx.json \
+        -O /opt/piper/voices/hi_IN-rohan-medium.onnx.json
+
+# Copy startup script
+COPY start_hf.sh /app/start_hf.sh
+
+# Env defaults
+ENV PORT=7860
+ENV PROVIDER=groq
+ENV PIPER_BINARY=/opt/piper/piper
+ENV PIPER_VOICE_DIR=/opt/piper/voices
+ENV LIBRETRANSLATE_URL=http://localhost:5000/translate
+
+EXPOSE 7860
+
+CMD ["/app/start_hf.sh"]

start_hf.sh

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+#!/bin/bash
+# Start LibreTranslate in background
+source /opt/venvs/libretranslate/bin/activate
+libretranslate --host 0.0.0.0 --port 5000 --load-only en,hi &
+deactivate
+
+# Warmup LibreTranslate after 10 seconds
+sleep 10 && curl -s -X POST http://localhost:5000/translate \
+    -H "Content-Type: application/json" \
+    -d '{"q":"warmup","source":"en","target":"hi"}' > /dev/null 2>&1 &
+
+# Start DeepShell
+exec python -m deepshell