Add update_apt_proxy_all.sh script with interactive proxy configuration for LXC containers and VMs

scripts/misc/update_apt_proxy_all.md

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+# update_apt_proxy_all.sh
+
+This script automates the configuration of the apt-cacher-ng proxy for all Proxmox LXC containers, VMs (with QEMU Guest Agent), and optionally the Proxmox node itself.
+
+## Features
+
+- Interactive prompts for proxy IP, port, and target selection (LXC, VM, All, Node).
+- Updates `/etc/apt/apt.conf.d/01proxy` in selected targets.
+- Works with both LXC containers and VMs (requires QEMU Guest Agent for VMs).
+- Optionally updates the Proxmox node itself.
+
+## Usage
+
+You can run the script directly if it’s cloned locally:
+
+```bash
+bash scripts/misc/update_apt_proxy_all.sh
+```
+
+Or, run it directly from the raw link (no need to clone):
+
+```bash
+bash <(curl -s https://git.lewsion.com/endrence/proxmox-scripts/raw/branch/main/scripts/misc/update_apt_proxy_all.sh)
+```
+
+Follow the prompts to select targets and configure the proxy.
+
+## Requirements
+
+- Proxmox environment with `pct` and `qm` commands available.
+- QEMU Guest Agent installed in VMs for VM updates.
+
+## License
+
+MIT