feat(ai,aquamarine): expose board fans and temperatures via SuperIO (#456)

* feat(ai): load nct6683 for the board's NCT6687D SuperIO
* feat(aquamarine): load nct6775 for the board's NCT6798D SuperIO

Assisted-by: DeepSeek Harness (deepseek-flash)

hosts/idols-aquamarine/default.nix

@@ -31,6 +31,10 @@ in
     ./secureboot.nix
   ];
 
+  # Bind the board's NCT6798D SuperIO, otherwise fan RPM and board temperatures
+  # are missing.
+  boot.kernelModules = [ "nct6775" ];
+
   # Zram consumes physical memory for compression, which deadlocks when the
   # model being loaded approaches the physical memory limit — exactly the
   # workload this host exists for. Use the disk swapfile that disko creates at