fix: second round audit - backup paths, cleanup, dead code

CT scripts:
- ct/hoodik.sh: backup to /opt instead of /tmp
- ct/pixelfed.sh: backup to /opt, add CLEAN_INSTALL=1
- ct/skylite-ux.sh: backup to /opt instead of /tmp

Install scripts:
- install/alpine-install.sh: add missing cleanup_lxc
- install/ubuntu-install.sh: replace manual apt-get cleanup with cleanup_lxc
- install/debian-install.sh: apt-get -> apt
- install/hoodik-install.sh: remove 40 lines of dead commented code
- install/step-ca-install.sh: remove  from export builtins

install/hoodik-install.sh

@@ -13,48 +13,8 @@ setting_up_container
 network_check
 update_os
 
-#msg_info "Installing Dependencies"
-#$STD apt-get install -y \
-#  pkg-config \
-#  libssl-dev \
-#  libc6-dev \
-#  libpq-dev \
-#  clang \
-#  llvm \
-#  nettle-dev \
-#  build-essential \
-#  make
-#msg_ok "Installed Dependencies"
-
-#setup_rust
-#NODE_VERSION="22" NODE_MODULE="yarn" setup_nodejs
-#fetch_and_deploy_gh_release "hoodik" "hudikhq/hoodik" "tarball" "latest" "/opt/hoodik"
 fetch_and_deploy_gh_release "hoodik" "hudikhq/hoodik" "prebuild" "latest" "/opt/hoodik" "*x86_64.tar.gz"
 
-#msg_info "Installing wasm-pack"
-#$STD cargo install wasm-pack
-#msg_ok "Installed wasm-pack"
-
-#msg_info "Building Hoodik Frontend"
-#cd /opt/hoodik
-#$STD yarn install --frozen-lockfile
-#$STD yarn wasm-pack
-#$STD yarn web:build
-#msg_ok "Built Hoodik Frontend"
-
-#msg_info "Building Hoodik Backend"
-#cd /opt/hoodik
-#$STD cargo build --release
-#cp /opt/hoodik/target/release/hoodik /usr/local/bin/hoodik
-#chmod +x /usr/local/bin/hoodik
-#msg_ok "Built Hoodik Backend"
-
-#msg_info "Cleaning up build artifacts"
-#rm -rf /opt/hoodik/target
-#rm -rf /root/.cargo/registry
-#rm -rf /opt/hoodik/node_modules
-#msg_ok "Cleaned up build artifacts"
-
 msg_info "Configuring Hoodik"
 mkdir -p /opt/hoodik_data
 JWT_SECRET=$(openssl rand -base64 32 | tr -dc 'a-zA-Z0-9' | cut -c1-32)
@@ -81,7 +41,6 @@ Type=simple
 User=root
 WorkingDirectory=/opt/hoodik_data
 EnvironmentFile=/opt/hoodik/.env
-#ExecStart=/usr/local/bin/hoodik
 ExecStart=/opt/hoodik
 Restart=always
 RestartSec=5