chore: remove dead debug code — isDevMode, debug CSS, __DEV__ flag

miniprogram/config/env.js

@@ -1,4 +1,3 @@
-// Production: change to 'prod' to disable debug buttons and mock endpoints
 var ENV = 'prod'
 
 var API_BASES = {
@@ -7,10 +6,7 @@ var API_BASES = {
   prod: 'https://api.vsai.net.cn'
 }
 
-var __DEV__ = ENV !== 'prod'
-
 module.exports = {
   ENV: ENV,
-  API_BASE: API_BASES[ENV],
-  __DEV__: __DEV__
+  API_BASE: API_BASES[ENV]
 }