feat: add plugin version command

test/channels/qq/bridge.test.mjs

@@ -673,6 +673,7 @@ test('QQ lists models and presets without prompting and advertises fast commands
   for (const command of [
     '/models', '/model', '/reasoninglist', '/reasonings', '/reasoning',
     '/presetlist', '/preset', '/preset --default', '/stop', '/steer',
+    '/version',
   ]) {
     assert.equal(help.includes(command), true, command);
   }