Add 9Router control plugin (#291)

* Add 9Router panel plugin

This commit introduces the initial version of the 9Router panel plugin.
It provides a Noctalia panel to manage 9Router model combos directly
from the bar, without requiring the web dashboard.

Key features:
- List, create, rename, and delete model combos.
- Reorder models within a combo via drag-and-drop.
- Change combo routing kind (fallback, round-robin, fusion).
- Search and filter combos.
- Supports 9Router dashboard authentication via CLI token or password.

Includes a bar widget showing connection status, a full UI panel,
and a background service to interact with the 9Router REST API.
Translations for English and Vietnamese are included.

* Rename 9Router Panel to 9Router Control

Update plugin IDs, IPC commands, and internal references.

* Quote shell args in service commands

Add shell_quote() for URLs, bodies, and file paths passed to
noctalia.runAsync. Declare required external commands in plugin.toml
and document them in the README.

9router-control/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 weinguyen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.