feat: add Crush MCP server configurations and validate multiple MCP servers

- Add crush.json with comprehensive MCP configurations for Crush AI assistant
- Configure stdio-based MCPs: penpot, context7, docker, drawio, redmine
- Configure HTTP-based MCP: nextcloud (port 8083 with SSE endpoint)
- Fix mcp-redmine Dockerfile with correct python module entrypoint
- Fix nextcloud-mcp Dockerfile to handle .dockerignore blocking observability
- Fix drawio-mcp Dockerfile to use pnpm and correct build directory
- Update docker-compose.yml with proper MCP server configurations
- Add environment variable configuration for MCPs requiring external services
- Create MCP validation script to test servers with protocol messages
- Update STATUS.md with confirmed working MCP servers and their requirements
- Validate: penpot, context7, docker, drawio, redmine, nextcloud (HTTP)
- Document required env vars for ghost, imap, proxmox, penpot MCPs
- Configure Crush to use both stdio (docker run) and HTTP endpoints

dockerfiles/nextcloud-mcp/Dockerfile

@@ -0,0 +1,44 @@
+FROM docker.io/library/python:3.12-slim
+
+# Install uv
+COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
+
+# Install dependencies
+RUN apt update && apt install --no-install-recommends --no-install-suggests -y \
+    git \
+    tesseract-ocr \
+    sqlite3 && apt clean
+
+WORKDIR /app
+
+COPY pyproject.toml uv.lock README.md ./
+
+RUN uv sync --no-dev --no-install-project --no-cache
+
+# Copy source code (create permissive .dockerignore first)
+# We need to override the vendor .dockerignore
+RUN rm -f /app/.dockerignore 2>/dev/null || true
+RUN cat > /app/.dockerignore << 'EOF'
+*.pyc
+__pycache__/
+.venv/
+.DS_Store
+.git/
+.gitignore
+uv.lock
+README.md
+ARCHITECTURE.md
+CONTRIBUTING.md
+DEVELOPMENT.md
+PROMPTS.md
+TROUBLESHOOTING.md
+EOF
+COPY . .
+
+RUN uv sync --no-dev --no-editable --no-cache
+
+ENV PYTHONUNBUFFERED=1
+ENV PATH=/app/.venv/bin:$PATH
+
+ENTRYPOINT ["/app/.venv/bin/nextcloud-mcp-server"]
+CMD ["run"]