feat: toggle skills UI + Node.js dans l'image + docs MCP/skills

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/api/client.ts

@@ -265,6 +265,7 @@ export interface AgentConfig {
   self_review: boolean;
   rag_enabled: boolean;
   embed_model: string;
+  skills_enabled: boolean;
   keep_alive: string;
 }
 

frontend/src/panels/SettingsView.tsx

@@ -434,6 +434,8 @@ export function SettingsView() {
                      "Relit et révise la réponse avant de la donner"] as const,
                     ["rag_enabled", "Mémoire long-terme (RAG)",
                      "Se souvient des anciennes sessions (modèle d'embedding requis)"] as const,
+                    ["skills_enabled", "Skills automatiques",
+                     "Méthodes expertes injectées selon la tâche (débogage, web, refactor…)"] as const,
                   ].map(([key, label, desc], i) => (
                     <div
                       key={key}