### System details

Thinkpad P14S Gen 6 Intel - Arrow Lake Ultra 7 255H

### What's wrong?

The udev rule in `install/config/powerprofilesctl-rules.sh` matches on `ATTR{type}=="Mains"`, which assumes the `AC` power supply device fires udev `change` events on plug/unplug. On ThinkPads and likely other USB-C only machines, the `AC` device never fires these events, only the `ucsi-source-psy-*` devices do.

Additionally, `power-profiles-daemon` is left in a disabled state after the update, which prevents profile switching entirely even if the udev rule matched.

### Steps to reproduce

1. Install or update to v3.6.0 on a USB-C only machine (e.g. Thinkpad)
2. Plug or unplug the charger
3. Power profile does not switch

### Diagnosis

The `AC` device exists and reports correctly:
```
$ cat /sys/class/power_supply/AC/type
Mains
$ cat /sys/class/power_supply/AC/online
1
```

But it never fires a udev `change` event. Only the USB-C port devices fire events:
```
$ udevadm monitor --property | grep -A5 "power_supply"
# Only ucsi-source-psy-USBC000:* events appear on plug/unplug
# /sys/class/power_supply/AC never appears
```

The `ucsi` devices have `POWER_SUPPLY_TYPE=USB`, not `Mains`, so the existing rule never matches.

Also, after the update:
```
$ systemctl status power-profiles-daemon
... disabled ...
```

### Fix

In `install/config/powerprofilesctl-rules.sh`, we could add rules for USB type devices alongside the existing Mains rules, but I'm not positive if this is the best route.

```bash
# Existing Mains rules...
SUBSYSTEM=="power_supply", ATTR{type}=="Mains", ATTR{online}=="0", RUN+="..."
SUBSYSTEM=="power_supply", ATTR{type}=="Mains", ATTR{online}=="1", RUN+="..."

# Add USB-C support for machines where AC device doesn't fire events
SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_TYPE}=="USB", ATTR{online}=="0", RUN+="..."
SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_TYPE}=="USB", ATTR{online}=="1", RUN+="..."
```

Also ensure `power-profiles-daemon` is enabled during install/update.