Feat: location rule for admin UI (#10894)

### What problem does this PR solve?

Location rule for admin UI.

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

docker/nginx/ragflow.https.conf

@@ -22,6 +22,11 @@ server {
     gzip_vary on;
     gzip_disable "MSIE [1-6]\.";
 
+    location ~ ^/api/v1/admin {
+        proxy_pass http://ragflow:9381;
+        include proxy.conf;
+    }
+
     location ~ ^/(v1|api) {
         proxy_pass http://ragflow:9380;
         include proxy.conf;