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>

docs/scripting.md

@@ -200,6 +200,78 @@ nautctl --socket /tmp/nautd.sock add file.torrent /downloads/42
 If `torrent_id` is unknown or is being removed, `naut.move_file` raises a
 `move_file failed` error in the hook.
 
+### `naut.get_labels(torrent_id)`
+
+Return the torrent's labels as a **plain array (table) of strings**. Labels are
+the user-assigned tags/category set in the web UI (or via the `set_labels` RPC);
+they are stored on the daemon, persisted across restarts, and surfaced here so a
+script can branch on them (e.g. route a finished file by its label).
+
+**Arguments**
+
+| # | Name | Lua type | Notes |
+|---|---|---|---|
+| 1 | `torrent_id` | `integer` | must be ≥ 0 |
+
+**Return value:** a sequence table of strings, e.g. `{"anime", "airing"}`. The
+table is **empty** (`#labels == 0`) when the torrent has no labels or is unknown
+— it is never `nil`, so it is always safe to iterate.
+
+```lua
+function on_file_complete(event)
+    local labels = naut.get_labels(event.torrent_id)
+    for _, label in ipairs(labels) do
+        if label == "anime" then
+            naut.move_file(event.torrent_id, event.index,
+                           "/archive/anime/" .. event.path)
+            return
+        end
+    end
+end
+```
+
+Labels reflect the daemon's current state at call time (re-read on every call),
+so a script always sees the latest assignment.
+
+### `naut.define_settings({ ... })`
+
+Declare the user-configurable variables the script reads, so they can be edited
+in the web UI (**Automation ▸ Settings**) instead of by hand in the source. Pass
+an array of entries:
+
+| Field | Lua type | Meaning |
+|---|---|---|
+| `key` | `string` | identifier passed to `naut.get_setting` |
+| `label` | `string` | human label shown in the form (defaults to `key`) |
+| `type` | `string` | `"string"`, `"bool"`, or `"number"` (drives the widget + the type returned by `get_setting`) |
+| `default` | string/bool/number | value used until the user sets one |
+
+Call it once at load time (re-declaring replaces the schema). The values the user
+saves persist across restarts, independently of the script source.
+
+### `naut.get_setting(key)`
+
+Return the current value of a declared setting: the user-saved value if present,
+otherwise the declared default. The result is **typed** per the schema — a Lua
+`boolean` for `bool`, a `number` for `number`, a `string` otherwise — or `nil`
+if the key was never declared. Re-read it on each use so live edits take effect
+without reloading the script.
+
+```lua
+naut.define_settings({
+  { key = "library_root", label = "Library root", type = "string",
+    default = "/media/anime" },
+  { key = "only_video",   label = "Only video files", type = "bool",
+    default = true },
+})
+
+function on_file_complete(event)
+  if naut.get_setting("only_video") and not is_video(event.path) then return end
+  local root = naut.get_setting("library_root")
+  naut.move_file(event.torrent_id, event.index, root .. "/" .. basename(event.path))
+end
+```
+
 ---
 
 ## 7. Error handling & observability