Normalize Nix module formatting and update flake.lock

Consistently format module argument blocks and convert aligned
package comments to inline comments. Trim trailing whitespace and
minor layout tweaks across modules. Bump opencode rev, narHash and
lastModified in flake.lock and remove the original dev ref.

modules/gpu-amd.nix

@@ -1,16 +1,21 @@
 # modules/gpu-amd.nix
 # AMD GPU configuration: drivers, Vulkan, VA-API hardware acceleration, CoreCtrl
-{ config, pkgs, lib, ... }:
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
 
 {
   # Enable OpenGL/Vulkan
   hardware.graphics = {
     enable = true;
-    enable32Bit = true;  # For Steam and 32-bit games
+    enable32Bit = true; # For Steam and 32-bit games
 
     extraPackages = with pkgs; [
       # VA-API for hardware video acceleration
-      libva-vdpau-driver  # Renamed from vaapiVdpau
+      libva-vdpau-driver # Renamed from vaapiVdpau
       libvdpau-va-gl
 
       # OpenCL support (optional, for compute workloads)
@@ -45,15 +50,15 @@
   # GPU monitoring tools
   environment.systemPackages = with pkgs; [
     # Monitoring
-    radeontop           # AMD GPU monitoring (like nvidia-smi)
-    nvtopPackages.amd   # Modern GPU monitor with AMD support
+    radeontop # AMD GPU monitoring (like nvidia-smi)
+    nvtopPackages.amd # Modern GPU monitor with AMD support
 
     # Vulkan tools
-    vulkan-tools        # vulkaninfo, etc.
+    vulkan-tools # vulkaninfo, etc.
     vulkan-loader
 
     # Video acceleration verification
-    libva-utils         # vainfo - verify VA-API
-    vdpauinfo           # Verify VDPAU
+    libva-utils # vainfo - verify VA-API
+    vdpauinfo # Verify VDPAU
   ];
 }