feat: Introduce a dedicated FFmpeg microservice for video processing, integrated into the Docker Compose setup.

ffmpeg-service/Dockerfile

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+FROM python:3.11-slim
+
+# Install system dependencies including FFmpeg and fonts
+RUN apt-get update && apt-get install -y \
+    ffmpeg \
+    fonts-dejavu \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Copy requirements first for better caching
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY main.py .
+
+# Create API Key env var (should be overridden in docker-compose)
+ENV API_KEY=default-dev-key
+
+# Expose port
+EXPOSE 8000
+
+# Run the application
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]