fix(hass): nfandroidtv proxy

the service on the TV is unreliable, so proxy it with a fake success
response when offline to satisfy the home-assistant integration

modules/nixos/nginx/listen.nix

@@ -113,7 +113,7 @@ let
     lib,
     ...
   }: let
-    inherit (gensokyo-zone.lib) mkAlmostOptionDefault;
+    inherit (gensokyo-zone.lib) mkAlmostOptionDefault mkAddress6;
     inherit (lib.options) mkOption;
     inherit (lib.modules) mkIf mkOptionDefault mkForce;
     inherit (lib.attrsets) attrValues mapAttrs;
@@ -123,7 +123,7 @@ let
     enabledCfg = filter (port: port.enable) cfg;
     mkListen = listen: addr: let
       listenAttrs = {
-        inherit addr;
+        addr = mkAddress6 addr;
         inherit (listen) port ssl extraParameters proxyProtocol;
       };
     in

modules/nixos/nginx/upstream.nix

@@ -216,10 +216,11 @@ let
 
     config = let
       enabledServers = filterAttrs (_: server: server.enable) config.servers;
+      activeServers = filterAttrs (_: server: server.settings.backup or false == false) enabledServers;
       assertServers = v: assert enabledServers != {}; v;
     in {
       ssl.enable = mkIf (any (server: server.ssl.enable) (attrValues enabledServers)) (mkAlmostOptionDefault true);
-      defaultServerName = findSingle (_: true) null null (attrNames enabledServers);
+      defaultServerName = findSingle (_: true) null null (attrNames activeServers);
       upstreamConfig = mkMerge (
         mapAttrsToList (_: server: mkIf server.enable server.serverDirective) config.servers
         ++ [config.extraConfig]

modules/system/exports/nfandroidtv.nix

@@ -0,0 +1,16 @@
+{
+  lib,
+  gensokyo-zone,
+  ...
+}: let
+  inherit (gensokyo-zone.lib) mkAlmostOptionDefault;
+in {
+  config.exports.services.nfandroidtv = {config, ...}: {
+    displayName = mkAlmostOptionDefault "Notifications for Android TV";
+    ports.default = {
+      port = mkAlmostOptionDefault 7676;
+      protocol = "http";
+      #status.enable = mkAlmostOptionDefault true;
+    };
+  };
+}