refactor(channels): make built-in channels self-contained (#4908)

* refactor(channels): own setup and instance contracts

* refactor(channels): isolate management contracts

* refactor(channels): normalize activation contracts

* fix(channels): enforce management contracts

* refactor(channels): finish setup ownership migration

* fix(channels): harden management contracts

* fix(channels): enforce lazy loading and runtime ownership

* fix(feishu): make multi-instance startup idempotent

* fix(webui): render channel setup contracts cleanly

* fix(feishu): stop websocket clients cleanly

* fix(channels): enforce persistence and activation gates

* fix(channels): preserve global feature action scope

* fix(channels): apply defaults for single plugins

* fix(channels): enforce management contract boundaries

* refactor(feishu): remove identity helper indirection

* fix(channels): preserve management setup contracts

* refactor(channels): generalize instance settings UI

* refactor(channels): package channel plugins with web UI metadata

* refactor(channels): make built-ins self-contained packages

* test(channels): colocate tests with channel packages

* fix(dingtalk): use official brand icon

* feat(channels): colocate webui translations

* docs(channels): clarify plugin ownership

* test(exec): remove output wait race

* refactor(channels): unify plugin descriptors

* fix(channels): enforce descriptor-owned contracts

* refactor(channels): finish package-owned plugin setup

* refactor(channels): use repository-owned packages only

* fix(channels): self-describe dependencies and runtime state

* fix(channels): warn about legacy entry points

webui/src/i18n/locales/es/common.json

@@ -514,13 +514,51 @@
       "needsConfig": "Necesita configuración",
       "connect": "Conectar",
       "reconnect": "Reconectar",
-      "feishuQrAlt": "Código QR de conexión de Feishu",
-      "feishuScanTitle": "Escanea con Feishu",
-      "feishuScanDescription": "Usa Feishu o Lark en tu teléfono para escanear este código. nanobot terminará la configuración automáticamente después de la autorización.",
-      "feishuWaiting": "Esperando autorización...",
-      "feishuConnected": "Feishu está conectado.",
-      "feishuConnectStopped": "Conexión detenida.",
-      "feishuConnecting": "Conectando..."
+      "advanced": "Avanzado",
+      "checkAndEnable": "Comprobar y activar",
+      "checkConnection": "Comprobar conexión",
+      "checkedAndEnabled": "Comprobado y activado.",
+      "checking": "Comprobando...",
+      "checkOnly": "Solo comprobar",
+      "commandCopied": "Comando copiado.",
+      "commandCopyFailed": "No se pudo copiar el comando.",
+      "configuredInstances": "{{count}} instancias configuradas",
+      "connectPreview": "El siguiente paso es la conexión en el navegador. Por ahora, ejecuta el comando siguiente.",
+      "copyCommand": "Copiar comando",
+      "filterAll": "Todos",
+      "filterOff": "Desactivados",
+      "filterOn": "Activados",
+      "helperCopied": "{{name}} copiado.",
+      "helperCopyFailed": "No se pudo copiar {{name}}.",
+      "hideSecret": "Ocultar secreto",
+      "instanceConfigured": "Configurada",
+      "instanceNeedsSetup": "Requiere configuración",
+      "runtimeFailed": "Error al iniciar",
+      "runtimeStarting": "Iniciando",
+      "runtimeStopped": "No está en ejecución",
+      "managedByWebui": "Gestionado por WebUI",
+      "officialGuide": "Guía oficial",
+      "optional": "Opcional",
+      "providerPreset": "Proveedor",
+      "requiredSetup": "Configuración requerida",
+      "savedSecret": "Guardado",
+      "savedSecretPlaceholder": "Secreto guardado",
+      "savedSettings": "Configuración guardada.",
+      "saveSettings": "Guardar configuración",
+      "selectChannel": "Ver la configuración de {{name}}",
+      "setupSteps": "Siguientes pasos",
+      "showSecret": "Mostrar secreto",
+      "toggleChannel": "Canal {{name}}",
+      "toggleInstance": "Instancia {{name}}",
+      "tryIt": "Pruébalo",
+      "validationFailed": "Comprueba la configuración requerida antes de activar.",
+      "validation": {
+        "connected": "Conectado",
+        "configured": "Configurado manualmente",
+        "needs_setup": "Requiere configuración",
+        "invalid": "No válido",
+        "unsupported": "Configuración manual"
+      }
     },
     "nanobotFeatures": {
       "enabled": "Activado",