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_filemove.c

@@ -108,6 +108,22 @@ int main(void) {
           memcmp(got1, global + mi.files[0].length, l1) == 0);
     free(got1);
 
+    /* Simulate a daemon restart: file 0 now lives at `dest`, not under `root`.
+     * Reopening with its saved location as an override must pick it up in place
+     * so resume verifies every piece -- if the override were ignored, file 0
+     * would open as an empty placeholder under root and resume would fail. */
+    const char *overrides[2] = { dest, NULL };
+    naut_storage_opts ropts = { .preallocate = true, .overrides = overrides };
+    naut_storage *st2 =
+        naut_storage_open_opts(mi.files, mi.num_files, root, &ropts, &err);
+    CHECK(st2 && err == NAUT_OK);
+    naut_download *d2 = naut_download_create(&mi, st2);
+    CHECK(d2 != NULL);
+    CHECK(naut_download_resume(d2) == NAUT_OK);
+    CHECK(naut_download_complete(d2));   /* both files verified from their homes */
+    naut_download_destroy(d2);
+    naut_storage_close(st2);
+
     naut_download_destroy(d);
     free(global); free(tor); naut_metainfo_free(&mi);
     char cmd[600]; snprintf(cmd, sizeof cmd, "rm -rf '%s' '%s'", root, destdir);