Remove conflicting mcp_server/Dockerfile with cache mounts

The mcp_server/Dockerfile contained --mount=type=cache directives that Railway doesn't support.
Railway will now use the root Dockerfile which is optimized for Railway deployment without cache mounts.

Fixes: Cache mount ID is not prefixed with cache key error

🚀 Generated with Claude Code (https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

mcp_server/Dockerfile

@@ -1,49 +0,0 @@
-# syntax=docker/dockerfile:1.9
-FROM python:3.12-slim
-
-WORKDIR /app
-
-# Install system dependencies
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    curl \
-    ca-certificates \
-    && rm -rf /var/lib/apt/lists/*
-
-# Install uv using the installer script
-ADD https://astral.sh/uv/install.sh /uv-installer.sh
-RUN sh /uv-installer.sh && rm /uv-installer.sh
-
-# Add uv to PATH
-ENV PATH="/root/.local/bin:${PATH}"
-
-# Configure uv for optimal Docker usage
-ENV UV_COMPILE_BYTECODE=1 \
-    UV_LINK_MODE=copy \
-    UV_PYTHON_DOWNLOADS=never \
-    MCP_SERVER_HOST="0.0.0.0" \
-    PYTHONUNBUFFERED=1
-
-# Create non-root user
-RUN groupadd -r app && useradd -r -d /app -g app app
-
-# Copy project files for dependency installation (better caching)
-COPY pyproject.toml uv.lock ./
-
-# Install dependencies first (better layer caching)
-RUN --mount=type=cache,id=/root/.cache/uv,target=/root/.cache/uv \
-    uv sync --frozen --no-dev
-
-# Copy application code
-COPY graphiti_mcp_server.py ./
-
-# Change ownership to app user
-RUN chown -Rv app:app /app
-
-# Switch to non-root user
-USER app
-
-# Expose port
-EXPOSE 8000
-
-# Command to run the application
-CMD ["uv", "run", "graphiti_mcp_server.py"]