Add Dockerfile for local development

Dockerfile

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+# Dockerfile for Router Model API - ZeroGPU
+# Supports both CPU and GPU (with nvidia-docker)
+
+FROM python:3.10-slim
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set working directory
+WORKDIR /app
+
+# Copy requirements first for better caching
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY app.py .
+
+# Set environment variables
+ENV PORT=7860
+ENV PYTHONUNBUFFERED=1
+
+# Expose port
+EXPOSE 7860
+
+# Run the application
+CMD ["python", "app.py"]
+