Add ham radio profile with FLEcli package

Introduces a custom packages overlay (pkgs/) for packages not in nixpkgs.
Adds FLEcli v0.1.7 for processing amateur radio logs (SOTA, POTA, WWFF).
Enables ham-radio profile on beefy.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

pkgs/flecli.nix

@@ -0,0 +1,28 @@
+# ABOUTME: FLEcli - Fast Log Entry CLI for amateur radio logging.
+# ABOUTME: Processes FLE-formatted files into ADIF for SOTA, POTA, WWFF, etc.
+{
+  lib,
+  buildGoModule,
+  fetchFromGitHub,
+}:
+
+buildGoModule rec {
+  pname = "flecli";
+  version = "0.1.7";
+
+  src = fetchFromGitHub {
+    owner = "on4kjm";
+    repo = "FLEcli";
+    rev = "v${version}";
+    hash = "sha256-6OFcShgUaK9RwonP6cl8eOD6Cu+F5LHZEUFPjCfWNV0=";
+  };
+
+  vendorHash = "sha256-6m01rcewPyy8pUXnIMwjyW+7I08pyJaTDliwTNp3fOM=";
+
+  meta = with lib; {
+    description = "Fast Log Entry CLI - process amateur radio logs";
+    homepage = "https://github.com/on4kjm/FLEcli";
+    license = licenses.mit;
+    mainProgram = "FLEcli";
+  };
+}