fix: update development API URL and add new image asset

- Changed the development API URL from https://bk.shuhi.com to https://bpi.shuhi.com.
- Added a new image asset (kf.png) to the static image directory.

.env.dev.js

@@ -1,5 +1,5 @@
 export default {
     "NODE_ENV": 'development',
-    "apiUrl":"https://bk.shuhi.com",
+    "apiUrl":"https://bpi.shuhi.com",
     "apiUrlPrefix":"/api",
 };