feat(albyhub): vendor v1.24.0 LND-only, no-frontend build

Replace the nixpkgs albyhub overrideAttrs patch-chain with a fully
vendored package at packages/albyhub for v1.24.0.

- modules/core/sovran-hub.nix: bump fallback version 1.8.0 -> 1.24.0
- modules/nwc-wallets.nix: build via pkgs.callPackage ../packages/albyhub
- packages/albyhub:
  - drop 0002-isolated-invoice-app-id.patch (fixed upstream)
  - add 0004-lnd-only.patch: strip LDK/Bark/Cashu/CLN/Phoenix backends
    from service/start.go, leaving only the LND case
  - add 0005-no-frontend.patch: remove //go:embed dist and the
    frontend handler registration
  - add default.nix: buildGoModule for v1.24.0 with no nodejs/yarn/
    bark-ffi-go/ldk-node deps (only stdenv.cc.cc), subPackages cmd/http

Keeps 0001-private-route-hints and 0003-loopback-bind-host. Does not
touch flake.nix, VERSION, or CHANGELOG.

modules/nwc-wallets.nix

@@ -3,13 +3,8 @@
 let
   albyHubPort = 18080;
   albyHubApiBase = "http://127.0.0.1:${toString albyHubPort}";
-  patchedAlbyHub = pkgs.albyhub.overrideAttrs (old: {
-    patches = (old.patches or []) ++ [
-      ../packages/albyhub/0001-private-route-hints.patch
-      ../packages/albyhub/0002-isolated-invoice-app-id.patch
-      ../packages/albyhub/0003-loopback-bind-host.patch
-    ];
-  });
+  vendoredAlbyHub = pkgs.callPackage ../packages/albyhub {};
+  patchedAlbyHub = vendoredAlbyHub;
 
   lndRpcAddress = lib.attrByPath [ "services" "lnd" "rpcAddress" ] "127.0.0.1" config;
   lndRpcPort = toString (lib.attrByPath [ "services" "lnd" "rpcPort" ] 10009 config);