Rebuild: add httpx to force new Docker image layer

Dockerfile

@@ -3,11 +3,10 @@ FROM python:3.11-slim
 WORKDIR /app
 
 RUN apt-get update && apt-get install -y --no-install-recommends ffmpeg fonts-dejavu-core && rm -rf /var/lib/apt/lists/*
-RUN pip install --no-cache-dir fastapi uvicorn requests beautifulsoup4 lxml jinja2 yt-dlp huggingface_hub gTTS pillow edge-tts python-dateutil
+RUN pip install --no-cache-dir fastapi uvicorn requests beautifulsoup4 lxml jinja2 yt-dlp huggingface_hub gTTS pillow edge-tts python-dateutil httpx
 
 COPY . .
 
-# Create a thin wrapper that imports both app_v2_entry and rewrite_slide
 RUN echo 'from app_v2_entry import app; import rewrite_slide' > _run.py
 
 EXPOSE 7860