fix: show devCode modal in email login for non-production mode

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

zhiyin-app/src/pages/login/login.vue

@@ -192,6 +192,9 @@ const sendEmailCode = () => {
         emailSent.value = true
         showToast('验证码已发送', 'success')
         startCooldown()
+        if (res.data?.devCode) {
+          uni.showModal({ title: '开发模式', content: `验证码：${res.data.devCode}`, showCancel: false })
+        }
       } else {
         const msg = (res.data && res.data.message) || '发送失败'
         showToast(msg)