fix: include pyproject.toml in Docker image for version info

The version was showing as 0.0.0 because pyproject.toml wasn't
being copied into the Docker image.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Dockerfile

@@ -12,6 +12,7 @@ COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
 # Copy application
+COPY pyproject.toml .
 COPY src/ ./src/
 COPY static/ ./static/