feat(rathole): add Cloudron package

- Implements Rathole packaging for Cloudron platform
- Includes Dockerfile for building from source/downloading binary
- Tested with basic build (will be tested with full functionality later)

🤖 Generated with Gemini CLI
Co-Authored-By: Gemini <noreply@google.com>

CloudronPackages/Rathole/Dockerfile

@@ -0,0 +1,32 @@
+FROM cloudron/base:4.2.0
+
+# Install necessary tools for downloading and unzipping
+RUN apt-get update && apt-get install -y \
+    curl \
+    unzip \
+    --no-install-recommends && \
+    rm -rf /var/lib/apt/lists/*
+
+# Download and extract Rathole
+ARG RATHOLE_VERSION=v0.5.0
+ARG ARCH=x86_64-unknown-linux-gnu
+ARG FILENAME=rathole-${ARCH}.zip
+ARG DOWNLOAD_URL=https://github.com/rathole-org/rathole/releases/download/${RATHOLE_VERSION}/${FILENAME}
+
+RUN curl -L ${DOWNLOAD_URL} -o /tmp/${FILENAME} && \
+    unzip /tmp/${FILENAME} -d /tmp/rathole && \
+    mv /tmp/rathole/rathole /usr/local/bin/rathole && \
+    rm -rf /tmp/${FILENAME} /tmp/rathole
+
+# Create a directory for configuration
+RUN mkdir -p /app/data
+
+# Set permissions
+RUN chmod +x /usr/local/bin/rathole
+
+WORKDIR /app/data
+
+# Expose the default Rathole server port
+EXPOSE 2333
+
+CMD ["/usr/local/bin/rathole", "-c", "/app/data/rathole.toml"]