fix: AI 请求加 170 秒超时保护，防止服务端无响应时无限挂起

src/main/capabilities/ai-service.ts

@@ -19,6 +19,7 @@ export async function chatCompletion(messages: ChatMessage[], options: { tempera
   const config = requireAiConfig();
   const base = config.baseUrl.replace(/\/+$/, "");
   const response = await fetch(base + "/chat/completions", {
+    signal: AbortSignal.timeout(170000),
     method: "POST",
     headers: { "Content-Type": "application/json", Authorization: "Bearer " + config.apiKey },
     body: JSON.stringify({ model: config.model, messages, temperature: options.temperature ?? 0.3 })