fix: remove Dockerfile - unused in sdk:gradio mode, was blocking build

Dockerfile

@@ -1,24 +0,0 @@
-FROM pytorch/pytorch:2.3.0-cuda12.1-cudnn8-runtime
-
-WORKDIR /app
-
-# Install curl for healthcheck
-RUN apt-get update && apt-get install -y curl && rm -rf /var/lib/apt/lists/*
-
-# torch + CUDA 12.1 + cuDNN 8 are already in the base image.
-# requirements.txt installs only the remaining app-level deps.
-COPY requirements.txt .
-RUN pip install --no-cache-dir -r requirements.txt
-
-# Copy all application code
-COPY . .
-
-# Port 8000 is required by hackathon infrastructure
-EXPOSE 8000
-
-# Health check — hackathon automated ping requires this to return 200
-HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
-    CMD curl -f http://localhost:8000/health || exit 1
-
-# Single worker — environment is 2vCPU, multi-worker causes resource issues
-CMD ["uvicorn", "env.server:app", "--host", "0.0.0.0", "--port", "8000", "--workers", "1"]