feat: add base path to resources (#17655)

Co-authored-by: fhliu4 <fhliu4@iflytek.com>

web/utils/var-basePath.js

@@ -0,0 +1,5 @@
+// export basePath to next.config.js
+// same as the one exported from var.ts
+module.exports = {
+  basePath: '',
+}

web/utils/var.ts

@@ -104,3 +104,7 @@ export const getVars = (value: string) => {
   })
   return res
 }
+
+// Set the value of basePath
+// example: /dify
+export const basePath = ''