登录页短信验证码请求改为扁平 JSON

- sendSmsCaptcha 去掉 form 包裹，captchaKey / captchaCode / mobile 直接平铺
- 与后端 SendSmsCaptchaReq 的 @RequestBody 接收方式对齐

pages/login/components/main.vue

@@ -186,11 +186,9 @@
         const app = this
         app.isLoading = true
         CaptchaApi.sendSmsCaptcha({
-            form: {
               captchaKey: app.captcha.key,
               captchaCode: app.captchaCode,
               mobile: app.mobile
-            }
           })
           .then(result => {
             // 显示发送成功