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>

examples/test_anime_sort.lua

@@ -7,7 +7,16 @@ local ref = require("anitomy")
 
 -- stub the host API the script calls, and silence its prints
 local captured
-_G.naut = { move_file = function(tid, idx, dest) captured = dest end }
+-- Per-torrent label stub: torrent 1 is labelled "anime"; others are unlabelled.
+local LABELS = { [1] = { "anime" } }
+-- Optional per-key setting overrides; nil falls back to the script's defaults.
+local SETTINGS = {}
+_G.naut = {
+    move_file = function(tid, idx, dest) captured = dest end,
+    get_labels = function(tid) return LABELS[tid] or {} end,
+    define_settings = function(_) end,            -- schema declaration: no-op here
+    get_setting = function(key) return SETTINGS[key] end,
+}
 local realprint = print
 _G.print = function() end
 
@@ -23,9 +32,9 @@ local configured_root = _G.anime_sort.destination({
 assert(configured_root, "could not derive SORTED_ROOT from anime_sort.lua")
 
 local fails = 0
-local function fire(path)
+local function fire(path, torrent_id)
     captured = nil
-    on_file_complete({ torrent_id = 1, index = 0, path = path })
+    on_file_complete({ torrent_id = torrent_id or 1, index = 0, path = path })
     return captured
 end
 local function expect(path, want_dest)
@@ -69,6 +78,42 @@ do
     end
 end
 
+-- label gate: a torrent without the "anime" label is left alone (no move),
+-- while an "anime"-labelled torrent is still sorted.
+do
+    local episode = "/downloads/[HorribleSubs] Boku no Hero Academia - 12 [1080p].mkv"
+    local unlabelled = fire(episode, 2)   -- torrent 2 has no labels
+    if unlabelled ~= nil then
+        fails = fails + 1
+        realprint("FAIL  unlabelled torrent should be skipped, got: "
+                  .. tostring(unlabelled))
+    else
+        realprint("ok    unlabelled torrent skipped")
+    end
+    local labelled = fire(episode, 1)     -- torrent 1 is labelled "anime"
+    if labelled == nil then
+        fails = fails + 1
+        realprint("FAIL  anime-labelled torrent should be sorted")
+    else
+        realprint("ok    anime-labelled torrent sorted")
+    end
+end
+
+-- settings: a value configured in the UI (delivered via naut.get_setting) takes
+-- effect live, without editing the script.
+do
+    SETTINGS.sorted_root = "/custom/lib"
+    local got = fire("/downloads/[HorribleSubs] Boku no Hero Academia - 12 [1080p].mkv", 1)
+    SETTINGS.sorted_root = nil
+    local want = "/custom/lib/Boku no Hero Academia/Season 01/Boku no Hero Academia - S01E12.mkv"
+    if got ~= want then
+        fails = fails + 1
+        realprint("FAIL  sorted_root override not applied, got: " .. tostring(got))
+    else
+        realprint("ok    sorted_root setting override applied")
+    end
+end
+
 -- drift guard: embedded parser must agree with anitomy.lua
 local embedded = _G.anime_sort.anitomy
 local drift = 0