fix: enable Furtka units inside custom_commands, not services list

archinstall runs `systemctl enable` over the `services` list *before*
custom_commands, so our own unit files (written in custom_commands)
didn't exist yet at enable-time and install aborted with
"Unit furtka-welcome.service does not exist". Keep `caddy` +
`avahi-daemon` in `services` since those are packaged units present
right after pacstrap; move `furtka-welcome` + `furtka-status.timer`
to a `systemctl enable` call appended to custom_commands so they fire
after the unit files land on disk.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/test_app.py

@@ -84,10 +84,16 @@ def test_build_archinstall_config_includes_post_install_bootstrap(monkeypatch):
 
     for pkg in ("caddy", "avahi", "nss-mdns"):
         assert pkg in cfg["packages"]
-    for svc in ("caddy", "avahi-daemon", "furtka-welcome", "furtka-status.timer"):
+    # Packaged units go in `services` (enabled before custom_commands runs);
+    # our own units don't exist at that point, so they must be enabled from
+    # within custom_commands after the unit files land on disk.
+    for svc in ("caddy", "avahi-daemon"):
         assert svc in cfg["services"]
+    assert "furtka-welcome" not in cfg["services"]
+    assert "furtka-status.timer" not in cfg["services"]
 
     joined = "\n".join(cfg["custom_commands"])
+    assert "systemctl enable furtka-welcome.service furtka-status.timer" in joined
     for path in (
         "/etc/caddy/Caddyfile",
         "/srv/furtka/www/index.html",

webinstaller/app.py

@@ -449,6 +449,12 @@ def _post_install_commands(hostname):
         ),
         nss_sed,
         hostname_sed,
+        # archinstall calls `systemctl enable` on `services` *before*
+        # custom_commands runs, so our own unit files aren't on disk yet at
+        # that point. Enable them here, after they exist. caddy /
+        # avahi-daemon stay in the `services` list — those are packaged
+        # units, present right after pacstrap.
+        "systemctl enable furtka-welcome.service furtka-status.timer",
     ]
 
 
@@ -476,13 +482,12 @@ def build_archinstall_config(s):
         "profile": {"type": "server"},
         "services": [
             "docker",
-            # Base OS post-install services. `furtka-welcome` refreshes
+            # Base OS post-install services. Only packaged units go here —
-            # /etc/issue with the landing-page URL; `furtka-status.timer`
+            # archinstall runs `systemctl enable` on this list *before*
-            # keeps /srv/furtka/www/status.json fresh for the dashboard.
+            # custom_commands, so our own furtka-welcome + furtka-status.timer
+            # units (written in custom_commands) are enabled there instead.
             "caddy",
             "avahi-daemon",
-            "furtka-welcome",
-            "furtka-status.timer",
         ],
         # `gpasswd -a <user> docker` has to stay first — adds the user to
         # the docker group once the group exists (archinstall creates users