calls: split callaudiod out and run it manually

hosts/common/programs/callaudiod.nix

@@ -0,0 +1,13 @@
+# https://github.com/droidian/callaudiod
+{ pkgs, ... }:
+{
+  sane.programs.callaudiod = {
+    packageUnwrapped = pkgs.rmDbusServices pkgs.callaudiod;
+
+    services.callaudiod = {
+      description = "callaudiod: dbus service to switch audio profiles and mute microphone";
+      partOf = [ "default" ];
+      command = "callaudiod";
+    };
+  };
+}

hosts/common/programs/calls.nix

@@ -56,6 +56,7 @@ in
     # this is only the username/endpoint: the actual password appears to be stored in gnome-keyring
     secrets.".config/calls/sip-account.cfg" = ../../../secrets/common/gnome_calls_sip-account.cfg.bin;
     suggestedPrograms = [
+      "callaudiod"  # runtime dependency (optional, but probably needed for mic muting?)
       "feedbackd"  # needs `phone-incoming-call`, in particular
       "gnome-keyring"  # to remember the password
     ];
@@ -73,7 +74,4 @@ in
       command = "env G_MESSAGES_DEBUG=all PULSE_LATENCY_MSEC=50 gnome-calls";
     };
   };
-  programs.calls = lib.mkIf cfg.enabled {
-    enable = true;
-  };
 }

hosts/common/programs/default.nix

@@ -14,6 +14,7 @@
     ./bonsai.nix
     ./brave.nix
     ./bubblewrap.nix
+    ./callaudiod.nix
     ./calls.nix
     ./cantata.nix
     ./catt.nix