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/hardware-configuration.nix

@@ -92,6 +92,16 @@
     ];
   };
 
+  fileSystems."/swap" = {
+    device = "/dev/mapper/root";
+    fsType = "btrfs";
+    neededForBoot = true;
+    options = [
+      "subvol=@swap"
+      "noatime"
+    ];
+  };
+
   swapDevices = [ ];
 
   # Enables DHCP on each ethernet and wireless interface. In case of scripted networking