fix(mitmproxy): Use Alpine package instead of pip install

mitmproxy_rs now requires Rust compilation which fails in chroot
environment without /proc mounted. Switch to Alpine's pre-built
mitmproxy package from the community repository.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package/secubox/secubox-app-mitmproxy/files/usr/sbin/mitmproxyctl

@@ -301,26 +301,17 @@ lxc_create_alpine_rootfs() {
 #!/bin/sh
 set -e
 
-# Update and install dependencies
+# Enable community repository for mitmproxy package
+sed -i 's|#\(.*community\)|\1|' /etc/apk/repositories
+
+# Update and install mitmproxy from Alpine packages (pre-built, no Rust needed)
 apk update
 apk add --no-cache \
-    python3 \
+    mitmproxy \
     py3-pip \
-    py3-wheel \
-    py3-cryptography \
-    py3-openssl \
-    py3-cffi \
-    py3-brotli \
-    py3-yaml \
-    py3-tornado \
-    py3-urwid \
-    libffi \
     openssl \
     ca-certificates
 
-# Install mitmproxy via pip
-pip3 install --break-system-packages mitmproxy
-
 # Create directories
 mkdir -p /data /var/log/mitmproxy /etc/mitmproxy/addons