fix(actualbudget): use upstream data layout

AGENTS.md

@@ -19,7 +19,7 @@ The domain model (Host, Module, Skeleton, Auto-loader, Enable convention, overla
 ## Gotchas
 
 - Actual Budget's NixOS service runs `actual-server` with `WorkingDirectory = services.actual.settings.dataDir`, and the `actual-server` CLI wrapper sets `ACTUAL_CONFIG_PATH=./config.json` when that current directory contains `config.json`, overriding the NixOS module's generated config path before the server loads configuration.
-  When migrating old community-script state, either preserve the old in-guest data path or remove/update the copied `config.json`, otherwise stale absolute paths such as `/opt/actualbudget-data/server-files` override the declarative module settings.
+  When migrating old community-script state to the normal upstream `/data` shape, override `systemd.services.actual.serviceConfig.WorkingDirectory` away from `/data` so a copied `/data/config.json` cannot shadow the declarative module settings.
 - Subagent completion delivery is non-blocking through immediate spawn, milestone notifications, retained terminal entries, and `subagent_list` or `subagent_result` retrieval.
   `subagent_wait` intentionally blocks the parent tool call until its condition or timeout, so do not use it merely to keep background work alive during an interactive workflow.
 - Nixvim's flake input following the root nixpkgs source does not make its Home Manager module reuse the host's `pkgs` instance.

guests/actualbudget.nix

@@ -16,8 +16,10 @@ my.guest {
       group = "storage";
       settings = {
         port = 5006;
-        dataDir = "/opt/actualbudget-data";
+        dataDir = "/data";
       };
     };
+
+    systemd.services.actual.serviceConfig.WorkingDirectory = "/";
   };
 } args

hosts/pikachu/default.nix

@@ -76,7 +76,7 @@
     autoStart = false;
     vlan = 20;
     mac = "BC:24:11:C1:CD:28";
-    mounts."/opt/actualbudget-data".hostPath = "/pikachu/data/actualbudget";
+    mounts."/data".hostPath = "/pikachu/data/actualbudget";
     limits = {
       memory = "2G";
       cpu = "200%";