feat(nginx): 添加 cnnl.newassetchain.io 反向代理配置（HTTPS/SSL）

- 域名: cnnl.newassetchain.io
- 后端: http://localhost:8765 (nac-cnnl-service)
- SSL: 通配符证书 *.newassetchain.io（有效期至 2027-01-31）
- HTTP → HTTPS 强制跳转
- CORS 支持（供立法 IDE、宪法沙箱调用）
- 请求体限制: 2MB

nginx/cnnl.newassetchain.io.conf

@@ -0,0 +1,64 @@
+# NAC CNNL HTTP Service - Nginx 反向代理配置
+# 域名: cnnl.newassetchain.io
+# 后端: http://localhost:8765
+
+server {
+    listen 80;
+    server_name cnnl.newassetchain.io;
+    return 301 https://$server_name$request_uri;
+}
+
+server {
+    listen 443 ssl;
+    http2 on;
+    server_name cnnl.newassetchain.io;
+
+    # 通配符证书（*.newassetchain.io，有效期至 2027-01-31）
+    ssl_certificate     /etc/ssl/certs/_.newassetchain.io.pem;
+    ssl_certificate_key /etc/ssl/certs/_.newassetchain.io.key;
+
+    ssl_protocols       TLSv1.2 TLSv1.3;
+    ssl_ciphers         ECDHE-RSA-AES128-GCM-SHA256:HIGH:!aNULL:!MD5:!RC4:!DHE;
+    ssl_prefer_server_ciphers on;
+    ssl_session_cache   shared:SSL:10m;
+    ssl_session_timeout 10m;
+
+    # 安全头
+    add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
+    add_header X-Content-Type-Options nosniff always;
+    add_header X-Frame-Options SAMEORIGIN always;
+
+    # 请求体大小限制（CNNL 源码最大 1MB）
+    client_max_body_size 2m;
+
+    location / {
+        proxy_pass         http://127.0.0.1:8765;
+        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 $scheme;
+        proxy_read_timeout 30s;
+        proxy_connect_timeout 5s;
+
+        # CORS 支持（供立法 IDE、宪法沙箱等工具调用）
+        add_header Access-Control-Allow-Origin  * always;
+        add_header Access-Control-Allow-Methods 'GET, POST, OPTIONS' always;
+        add_header Access-Control-Allow-Headers 'Content-Type, Authorization, X-Requested-With' always;
+
+        # OPTIONS 预检请求直接返回
+        if ($request_method = OPTIONS) {
+            return 204;
+        }
+    }
+
+    # 健康检查端点（不记录日志）
+    location = /api/v1/health {
+        proxy_pass         http://127.0.0.1:8765;
+        proxy_set_header   Host $host;
+        access_log off;
+    }
+
+    access_log  /www/wwwlogs/cnnl.newassetchain.io.log;
+    error_log   /www/wwwlogs/cnnl.newassetchain.io.error.log;
+}