Initial commit: Maskarr - Tracker proxy for *arr apps

- HTTP proxy server to modify User-Agent and headers for private trackers
  - Web UI with collapsible tracker cards and real-time validation
  - Multi-tracker support with persistent JSON configuration
  - Thread-safe configuration management
  - Full HTTP methods support (GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS)
  - REST API for tracker management
  - Docker support with multi-architecture builds (amd64, arm64, arm/v7)
  - CI/CD workflows for GitHub Actions and Gitea Actions
  - Automatic publishing to GitHub Container Registry and Gitea Registry

Dockerfile

@@ -0,0 +1,33 @@
+FROM python:3.11-slim
+
+LABEL maintainer="Maskarr"
+LABEL description="Tracker Proxy for *arr Applications"
+
+WORKDIR /app
+
+# Install dependencies
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy application
+COPY maskarr.py .
+
+# Create volume for config persistence
+VOLUME ["/app/config"]
+
+# Expose port
+EXPOSE 8888
+
+# Set environment variable for config location
+ENV CONFIG_PATH=/app/config/maskarr_config.json
+
+# Run as non-root user
+RUN useradd -m -u 1000 maskarr && \
+    chown -R maskarr:maskarr /app
+USER maskarr
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD python -c "import requests; requests.get('http://localhost:8888/', timeout=5)" || exit 1
+
+CMD ["python3", "-u", "maskarr.py"]