nautd/webui: scripting, labels, settings, set-location, pause fix

Session checkpoint on webui-plugin:
- engine dump (nautctl dump) + engine endgame integration
- per-file move locations persistence; torrent-level "Set location"
  with reset/keep-relative/leave-separate handling + residual prune
- Lua: naut.get_labels, define_settings/get_setting (script_host struct)
- daemon-owned labels (category+tags) + taxonomy persistence; webui write-through
- fix: pausing a completed/seeding torrent now sticks (stop wins over result)
- automation tab responsive layout; anime_sort label gating + settings

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

tests/unit/test_script.c

@@ -3,6 +3,7 @@
 
 #include <pthread.h>
 #include <stdatomic.h>
+#include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
@@ -30,13 +31,29 @@ static naut_err capture_move(void *opaque, uint64_t torrent_id,
     return NAUT_OK;
 }
 
+/* Hand the script a single label "anime" so the fixture can route on it. */
+static char **capture_labels(void *opaque, uint64_t torrent_id, size_t *count) {
+    (void)opaque;
+    (void)torrent_id;
+    char **labels = malloc(sizeof *labels);
+    if (!labels) { *count = 0; return NULL; }
+    labels[0] = strdup("anime");
+    *count = labels[0] ? 1 : 0;
+    return labels;
+}
+
 int main(void) {
     pthread_t owner = pthread_self();
     move_capture capture = {0};
     naut_event_bus *events = naut_event_bus_create();
     naut_err error;
+    naut_script_host host = {
+        .move_file = capture_move,
+        .labels = capture_labels,
+        .context = &capture,
+    };
     naut_script *script = naut_script_create(
-        events, NAUT_PHASE7_SCRIPT, 8, capture_move, &capture, &error);
+        events, NAUT_PHASE7_SCRIPT, 8, &host, &error);
     CHECK(script && error == NAUT_OK);
 
     naut_event event = {
@@ -65,7 +82,8 @@ int main(void) {
     CHECK(!pthread_equal(owner, capture.caller));
     CHECK_EQ(capture.torrent_id, 42);
     CHECK_EQ(capture.file_index, 3);
-    CHECK(strcmp(capture.destination, "/tmp/completed-file.moved") == 0);
+    /* Proves naut.get_labels surfaced the label string into Lua. */
+    CHECK(strcmp(capture.destination, "/tmp/completed-file.anime") == 0);
 
     naut_script_stats stats;
     naut_script_get_stats(script, &stats);