Add swagger ui for test http-api (#3012)

`python generates.py`

Convert postman files to openapi format files
Visit http://127.0.0.1:8081/swagger/ to conveniently debug the API.

www/swagger/index.css

@@ -0,0 +1,16 @@
+html {
+    box-sizing: border-box;
+    overflow: -moz-scrollbars-vertical;
+    overflow-y: scroll;
+}
+
+*,
+*:before,
+*:after {
+    box-sizing: inherit;
+}
+
+body {
+    margin: 0;
+    background: #fafafa;
+}