Add nix-gaming, Home Manager, and system improvements

- Add nix-gaming flake for gaming optimizations
- Add Home Manager for better user package management
- Enable zramSwap for memory compression
- Enable fwupd for firmware updates
- Enable power-profiles-daemon for power management
- Add PipeWire low-latency configuration
- Add platform optimizations from nix-gaming
- Add gaming tools: LACT, vkbasalt, discord
- Add dev tools: meld, dbeaver-bin, insomnia

Co-authored-by: ragusa-it <196988693+ragusa-it@users.noreply.github.com>

modules/gaming.nix

@@ -1,9 +1,18 @@
-{ pkgs, ... }:
+{ pkgs, inputs, ... }:
 
 {
   # Identification tags (shows in boot menu)
   system.nixos.tags = [ "gaming" "zen" ];
 
+  # --------------------------------------------------------------------------
+  # NIX-GAMING PLATFORM OPTIMIZATIONS
+  # --------------------------------------------------------------------------
+  imports = [
+    inputs.nix-gaming.nixosModules.platformOptimisations
+  ];
+  
+  nix-gaming.platformOptimisations.enable = true;
+
   # --------------------------------------------------------------------------
   # KERNEL - Zen for gaming performance
   # --------------------------------------------------------------------------
@@ -62,6 +71,7 @@
     # -- Performance Overlays --
     mangohud        # FPS counter, GPU stats
     goverlay        # MangoHud GUI config
+    vkbasalt        # Vulkan post-processing (sharpening, CAS)
 
     # -- Game Launchers --
     lutris          # Multi-platform launcher
@@ -76,6 +86,10 @@
     # -- Utilities --
     gamescope       # Micro-compositor for gaming
     corectrl        # AMD GPU control GUI
+    lact            # LACT - AMD GPU control (alternative to CoreCtrl)
+    
+    # -- Communication --
+    discord         # Voice chat and gaming communities
 
     # -- Optional Game Clients --
     # prismlauncher # Minecraft