feat: Use Docker SDK with fresh environment for Gradio 6.0.0.dev4

Following Gradio team's recommendation to use a fresh virtual environment,
switching from Gradio SDK to Docker SDK to avoid HF Spaces infrastructure
conflicts with mcp package versions.

Changes:
- Add Dockerfile with fresh Python 3.10 environment
- Install gradio[mcp,oauth]==6.0.0.dev4 in Dockerfile (separate from requirements.txt)
- Change README frontmatter: sdk: docker (was sdk: gradio)
- Remove gradio from requirements.txt (now in Dockerfile)

This bypasses HF Spaces' hardcoded 'mcp==1.8.1' installation which
conflicts with Gradio 6's requirement of 'mcp>=1.21.0'.

Docker SDK gives us full control over installation order and ensures
a fresh environment as recommended by Gradio developers.

Expected result: Successful build with Gradio 6 and working MCP tools!

Dockerfile

@@ -0,0 +1,40 @@
+# Use Python 3.10 base image
+FROM python:3.10-slim
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    git \
+    git-lfs \
+    ffmpeg \
+    libsm6 \
+    libxext6 \
+    cmake \
+    rsync \
+    libgl1 \
+    && rm -rf /var/lib/apt/lists/* \
+    && git lfs install
+
+# Copy requirements first (for better caching)
+COPY requirements.txt .
+
+# Fresh install of Gradio 6 as recommended by Gradio team
+# Install in a single command to avoid conflicts
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir "gradio[mcp,oauth]==6.0.0.dev4" && \
+    pip install --no-cache-dir -r requirements.txt
+
+# Copy application code
+COPY . .
+
+# Expose port
+EXPOSE 7860
+
+# Set environment variables
+ENV GRADIO_SERVER_NAME="0.0.0.0"
+ENV GRADIO_SERVER_PORT=7860
+
+# Run the application
+CMD ["python", "app.py"]

README.md

@@ -3,8 +3,7 @@ title: TraceMind MCP Server
 emoji: 🤖
 colorFrom: blue
 colorTo: purple
-sdk: gradio
-sdk_version: 5.49.1
+sdk: docker
 app_port: 7860
 pinned: false
 license: agpl-3.0

requirements.txt

@@ -1,5 +1,5 @@
 # Core dependencies
-gradio[mcp]==5.49.1
+# Note: gradio is installed separately in Dockerfile to avoid HF Spaces conflicts
 google-generativeai>=0.8.0
 datasets>=2.14.0
 pandas>=2.0.0