feat(packs): bitcoin, lnbits and aiolabs lightning packs

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

modules/packs/lnbits.nix

@@ -0,0 +1,25 @@
+# lnbits pack — the LNbits multi-project dev environment.
+#
+# STANDALONE-IMPORTABLE: imports the dev-env module and enables it, so a
+# third party importing only `nixosModules.lnbits` onto their own NixOS
+# gets the full dev environment (worktrees, regtest, tmux, pre-commit
+# hook) without needing omni core. dev-env was decoupled from omni.*
+# in an earlier commit precisely to make this possible. (This is what lets
+# the standalone lnbits-sensei scaffold be retired — see P8.)
+#
+# Configure the environment via the standard dev-env.* options
+# (dev-env.user, dev-env.root, dev-env.projects, …).
+{ config, lib, ... }:
+let
+  cfg = config.omni.packs.lnbits;
+in
+{
+  imports = [ ../dev-env ];
+
+  options.omni.packs.lnbits.enable =
+    lib.mkEnableOption "LNbits dev-environment pack (worktrees, regtest, tmux)";
+
+  config = lib.mkIf cfg.enable {
+    dev-env.enable = lib.mkDefault true;
+  };
+}