chore: 针对ThinkPHP 6.x 系列，支持自定义.env 文件加载

src/.env.development

@@ -0,0 +1,25 @@
+APP_DEBUG = true
+APP_TRACE = true
+
+[APP]
+DEFAULT_TIMEZONE = Asia/Shanghai
+ENV_MODE = development
+
+[LANG]
+default_lang = zh-cn
+
+[DATABASE]
+TYPE = mysql
+HOSTNAME = 127.0.0.1
+DATABASE = shop_mallnew_dev
+USERNAME = root
+PASSWORD = root
+HOSTPORT = 3306
+CHARSET = utf8
+DEBUG = true
+
+[redis]
+HOST = 127.0.0.1
+PORT = 6379
+PASSWORD = ''
+EXPIRY = 604800