refactor(aquamarine): move the whisper-asr module into asr/

Assisted-by: DeepSeek Harness (claude-opus-5-5)

hosts/idols-aquamarine/README.md

@@ -12,7 +12,7 @@ Manual BIOS and power-saving settings are recorded in
 | Part   | Model                                                 | Notes                                                   |
 | ------ | ----------------------------------------------------- | ------------------------------------------------------- |
 | Board  | Colorful CVN Z890 ARK FROZEN V20 (BIOS 1013)          | moved from `ai` on 2026-10-13, so its EFI vars come too |
-| CPU    | Intel Core Ultra 7 270K Plus                          | Arrow Lake; the NPU serves `whisper-asr` (./asr.nix)    |
+| CPU    | Intel Core Ultra 7 270K Plus                          | Arrow Lake; the NPU serves `whisper-asr` (./asr/)       |
 | Memory | 2x48G JUHOR (96G), 4800 MT/s                          | the 2x16G kit stayed with `ai`                          |
 | GPU    | 2x AMD Radeon AI PRO R9700, 32G each (RDNA4, gfx1201) | 64G of VRAM total                                       |
 | Root   | Fanxiang S790 2TB                                     | was `ai`'s `/data` disk until 2026-10-13                |

hosts/idols-aquamarine/asr/default.nix

@@ -94,7 +94,7 @@ in
 
     # Reads its model, writes its cache, uses the NPU and listens on the LAN.
     serviceConfig = mylib.systemdHardening.service // {
-      ExecStart = "${pythonEnv}/bin/python ${./asr/server.py}";
+      ExecStart = "${pythonEnv}/bin/python ${./server.py}";
       CacheDirectory = "whisper-asr";
       DynamicUser = true;
       Restart = "on-failure";

hosts/idols-aquamarine/default.nix

@@ -33,7 +33,7 @@ in
     ./secureboot.nix
 
     # services
-    ./asr.nix
+    ./asr
     ./idle-suspend.nix
   ];
 

hosts/idols-aquamarine/hardware-intel-cpu.nix

@@ -4,7 +4,7 @@
   ...
 }:
 {
-  # The NPU serves ./asr.nix; the driver's compiler lookup is fixed by
+  # The NPU serves ./asr; the driver's compiler lookup is fixed by
   # NixOS/nixpkgs#570230, which reached nixos-unstable-small first (WA-037).
   hardware.cpu.intel.npu.enable = true;
   nixpkgs.overlays = [ (_: _: { inherit (pkgs-small) intel-npu-driver; }) ];