feat(docker): add Dockerfile and .dockerignore for containerized environment setup

.dockerignore

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+# Version control
+.git
+.gitignore
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Virtual environments
+venv/
+ENV/
+.env
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# Test
+.pytest_cache/
+.coverage
+htmlcov/
+
+# Project specific
+rules_backup/
+
+# Documentation
+*.md

Dockerfile

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+# Use official Python base image
+FROM python:3.11-slim
+
+# Set working directory
+WORKDIR /app
+
+# Install system dependencies
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends gcc && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first for better caching
+COPY requirements.txt .
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the source code
+COPY . .
+
+# Install the package in editable mode
+RUN pip install -e .
+
+# Default environment variables
+ENV ADGUARD_HOST="http://localhost" \
+    ADGUARD_PORT=3000
+
+# Expose the application port
+EXPOSE 8000
+
+# Command to run the application
+CMD ["python", "-m", "simpleguardhome.main"]