Add configuration for Lenovo IdeaPad Gaming 3 15ach6

lenovo/ideapad/15ach6/README.md

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+# Lenovo IdeaPad Gaming 3 15ACH6
+
+This device supports "battery conservation mode", which charges the battery to only ~60%. This mode can be enabled using [TLP](https://linrunner.de/tlp/settings/bc-vendors.html#lenovo-non-thinkpad-series):
+
+## Device information
+
+Details from `tlp-stat`:
+
+```
+System         = LENOVO IdeaPad Gaming 3 15ACH6 82K2
+BIOS           = H3CN31WW(V2.01)
+EC Firmware    = 1.31
+OS Release     = NixOS 24.11 (Vicuna)
+Kernel         = 6.6.37 #1-NixOS SMP PREEMPT_DYNAMIC Fri Jul  5 07:34:07 UTC 2024 x86_64
+Init system    = systemd 
+Boot mode      = UEFI
+Suspend mode   = s2idle [deep]
+```
+
+`lspci` output:
+
+```
+01:00.0 3D controller: NVIDIA Corporation GA106M [GeForce RTX 3060 Mobile / Max-Q] (rev a1)
+06:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cezanne [Radeon Vega Series / Radeon Vega Mobile Series] (rev c6)
+```

lenovo/ideapad/15ach6/default.nix

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+{ lib, ... }:
+
+{
+  imports = [
+    ../../../common/cpu/amd
+    ../../../common/cpu/amd/pstate.nix
+    ../../../common/gpu/amd
+    ../../../common/gpu/nvidia/prime.nix
+    ../../../common/pc/laptop
+    ../../../common/pc/laptop/ssd
+  ];
+
+  hardware.nvidia = {
+    modesetting.enable = true;
+    prime = {
+      amdgpuBusId = "PCI:6:0:0";
+      nvidiaBusId = "PCI:1:0:0";
+    };
+  };
+}