清理掉无用的casbin缓存刷新，增加重新loadPolicy接口。

server/docs/docs.go

@@ -166,6 +166,40 @@ const docTemplate = `{
                 }
             }
         },
+        "/api/freshCasbin": {
+            "get": {
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "SysApi"
+                ],
+                "summary": "刷新casbin缓存",
+                "responses": {
+                    "200": {
+                        "description": "刷新成功",
+                        "schema": {
+                            "allOf": [
+                                {
+                                    "$ref": "#/definitions/response.Response"
+                                },
+                                {
+                                    "type": "object",
+                                    "properties": {
+                                        "msg": {
+                                            "type": "string"
+                                        }
+                                    }
+                                }
+                            ]
+                        }
+                    }
+                }
+            }
+        },
         "/api/getAllApis": {
             "post": {
                 "security": [