feat: idols-ai - use intel intel iGPU by default, choose Nvidia dGPU manullay - via prime (#258)

* feat: idols-ai - use intel intel iGPU by default, choose Nvidia dGPU manullay - via prime

* fix: niri - update output names for new motherboard

* fix: niri - DP-1 with prime offload mode - supports only 120HZ

* flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs-master':
    'github:nixos/nixpkgs/3879e47ce293fb2932d656aa56551a8e80718533?narHash=sha256-siN4x7y/S0FOdjPC1W0Z/vrX4Rlu%2BVClkEGngmSd0vM%3D' (2026-03-24)
  → 'github:nixos/nixpkgs/03de9fe87cb2dcec8da9dbaa3ad1c71ea7fef223?narHash=sha256-B7GmxbRADkklyXzV1ahgY4QhCpbQ3crzPCCs2hf6bPM%3D' (2026-04-26)

* flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs-stable':
    'github:nixos/nixpkgs/e9f278faa1d0c2fc835bd331d4666b59b505a410?narHash=sha256-Jms57zzlFf64ayKzzBWSE2SGvJmK%2BNGt8Gli71d9kmY%3D' (2026-03-14)
  → 'github:nixos/nixpkgs/a4bf06618f0b5ee50f14ed8f0da77d34ecc19160?narHash=sha256-AIiMJiqvGrN4HyLEbKAoCSRRYn0rnlW5VbKNIMIYqm4%3D' (2026-04-25)

hosts/idols-ai/default.nix

@@ -27,11 +27,14 @@ in
 
     # Include the results of the hardware scan.
     ./hardware-configuration.nix
-    ./nvidia.nix
-    ./ai
+    ./hardware-intel.nix
+    ./hardware-nvidia.nix
 
     ./preservation.nix
     ./secureboot.nix
+
+    # others
+    ./ai
   ];
 
   # Zram consumes physical memory for compression, which can cause a deadlock and system hang if the model size approaches the physical memory limit.