Add root Dockerfile for Render Docker deployment

Dockerfile

@@ -0,0 +1,25 @@
+FROM python:3.12-slim
+
+# Install system dependencies for OpenCV and pyttsx3/espeak
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    libgl1-mesa-glx \
+    libglib2.0-0 \
+    espeak \
+    alsa-utils \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /workspace
+
+# Copy and install python dependencies
+COPY backend/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy backend code
+COPY backend/ .
+
+# Expose FastAPI port
+EXPOSE 8000
+
+# Run FastAPI app
+CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]