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>

include/naut/storage.h

@@ -18,6 +18,12 @@ typedef struct naut_storage naut_storage;
 typedef struct {
     bool direct_io;
     bool preallocate;
+    /* Optional per-file path overrides, e.g. files moved out of `root` on a
+     * prior run. If non-NULL the array has one entry per file: where overrides[i]
+     * is non-NULL the file is opened at that path instead of `root`/<rel-path>,
+     * so a relocated file is picked up in place (no re-download, no placeholder
+     * recreated under `root`). A NULL entry uses the default location. */
+    const char *const *overrides;
 } naut_storage_opts;
 
 /* Open (creating + preallocating) all files under `root`. */