fix: 补齐兼容推理型模型——content空时取reasoning尾部答案，max_tokens提到2000

server/src/routes/admin.js

@@ -1199,11 +1199,17 @@ router.post('/trends/fill-plain', requirePermission('trend:write'), async (req,
         const r = await fetch(model.apiUrl, {
           method: 'POST',
           headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${model.apiKey}` },
-          body: JSON.stringify({ model: model.modelId, messages: [{ role: 'user', content: prompt }], max_tokens: 300, temperature: 0.5 }),
-          signal: AbortSignal.timeout(60_000),
+          body: JSON.stringify({ model: model.modelId, messages: [{ role: 'user', content: prompt }], max_tokens: 2000, temperature: 0.5 }),
+          signal: AbortSignal.timeout(90_000),
         })
         const j = await r.json()
-        const text = String(j?.choices?.[0]?.message?.content || '').trim()
+        const msg = j?.choices?.[0]?.message
+        // 推理型模型（flash-lite 系）正式答案在 content；思考占满时兜底取 reasoning 尾部
+        let text = String(msg?.content || '').trim()
+        if (!text && msg?.reasoning) {
+          const tail = String(msg.reasoning).split('\n').filter(Boolean).pop() || ''
+          text = tail.replace(/^["'“”]+|["'“”]+$/g, '').trim()
+        }
         const lines = text.split('\n').map(x => x.replace(/^(人话|对你)[：:]?\s*/, '').trim()).filter(Boolean)
         if (lines.length >= 2) {
           await Trend.updateOne({ _id: t._id }, { plainExplain: lines[0].slice(0, 60), takeAway: lines[1].slice(0, 60) })