fix(nb): resolve keyboard/touchpad and btrfs read-only issues after suspend

This commit addresses two critical suspend/resume issues on the nb host:

1. Keyboard and touchpad not working after suspend
   - Added i2c_hid_acpi kernel module
   - Created systemd service to reload the module after resume
   - Excluded input devices from TLP USB autosuspend

2. /nix/persist becoming read-only after suspend
   - Moved swap from /nix/persist to dedicated @swap subvolume
   - Added systemd service to remount /nix/persist if needed
   - Separated swap from persistent data to prevent btrfs corruption

Changes:
- Created hosts/nb/modules/suspend-fixes.nix with resume hooks
- Updated swap path from /nix/persist/swapfile to /swap/swapfile
- Added /swap filesystem mount for @swap btrfs subvolume
- Added USB_EXCLUDE_INPUT=1 to TLP configuration

Note: Manual step required before deployment - create @swap subvolume.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

hosts/nb/modules/desktop/default.nix

@@ -159,6 +159,7 @@ in {
     USB_EXCLUDE_PHONE = 0;
     USB_EXCLUDE_PRINTER = 1;
     USB_EXCLUDE_WWAN = 0;
+    USB_EXCLUDE_INPUT = 1;  # Exclude keyboard/touchpad to prevent suspend issues
 
     # Audio power saving
     SOUND_POWER_SAVE_ON_AC = 0;