Fix AI result panel visibility and nginx streaming headers.

ResultAI had h-0 collapsing output; add X-Accel-Buffering no, clearer fetch errors, and NGINX.md for gate proxy setup.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/NGINX.md

@@ -0,0 +1,60 @@
+# Nginx 反代 + AI 流式输出
+
+浏览器访问 `https://你的域名/api/ai` 必须能到达 Next.js（3130），且**关闭缓冲**，否则页面上 AI 解读会一直空白或等到超时。
+
+## 1. 验证
+
+在**服务器**上分别测试：
+
+```bash
+# 本地直连（应成功）
+curl -s http://127.0.0.1:3130/api/health
+
+# 经域名（也必须成功，否则是 Nginx 问题）
+curl -s https://gate.hyf2.cc/api/health
+```
+
+若本地成功、域名 404 或返回 HTML，说明 Nginx 未正确反代 `/api/`。
+
+## 2. 推荐配置
+
+```nginx
+server {
+    listen 443 ssl http2;
+    server_name gate.hyf2.cc;
+
+    # ssl_certificate ...;
+
+    location / {
+        proxy_pass http://127.0.0.1:3130;
+        proxy_http_version 1.1;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+
+        # AI 流式：必须关闭缓冲
+        proxy_buffering off;
+        proxy_cache off;
+        proxy_read_timeout 300s;
+        proxy_send_timeout 300s;
+        chunked_transfer_encoding on;
+    }
+}
+```
+
+修改后：
+
+```bash
+nginx -t && systemctl reload nginx
+```
+
+## 3. 浏览器测试
+
+```bash
+curl -N -X POST https://gate.hyf2.cc/api/ai \
+  -H "Content-Type: application/json" \
+  -d '{"mode":"bazi","payload":{"input":{"date":"1990-01-01","time":"12:00","gender":"male","longitude":120},"question":"测试","birthPlaceName":"上海市"}}'
+```
+
+应看到中文流式输出，而不是 HTML 404 页面。