fix(docker): remove deleted documents/examples copy, add presets (#48)

* fix(docker): remove deleted documents/examples copy, add presets

The cleanup PR removed documents/examples/ but the Dockerfile still
COPY''d that path, breaking the v3.9.0 release Docker build with:
  failed to calculate checksum of ref ...: "/documents/examples": not found

Drop the obsolete COPY and instead include presets/ and
config.example.yaml so users running the official Docker image get
the same out-of-the-box defaults as PyPI / NPM users.

* ci: refresh PR labels

---------

Co-authored-by: Lyonzin <lyonzin@users.noreply.github.com>

Author: lyonzin

Dockerfile

@@ -8,8 +8,8 @@ WORKDIR /app
 
 COPY pyproject.toml requirements.txt ./
 COPY mcp_server/ ./mcp_server/
-COPY documents/examples/ ./documents/examples/
-COPY LICENSE README.md ./
+COPY presets/ ./presets/
+COPY config.example.yaml LICENSE README.md ./
 
 RUN pip install --no-cache-dir -r requirements.txt