chore: 并入 iotlcm-app 历史到 app/（原提交 f40bda9）

app/server/internal/controller/system/system_v1_captcha.go

@@ -0,0 +1,17 @@
+package system
+
+import (
+	"context"
+
+	v1 "git.5iot.com/iotlcm-public/iotlcm-app/api/system/v1"
+	"git.5iot.com/iotlcm-public/iotlcm-app/internal/service"
+)
+
+func (c *ControllerV1) GetCaptcha(ctx context.Context, req *v1.GetCaptchaReq) (res *v1.GetCaptchaRes, err error) {
+	key, image, err := service.SysCaptcha().GenerateCaptcha(ctx)
+	res = &v1.GetCaptchaRes{
+		CaptchaID:    key,
+		CaptchaImage: image,
+	}
+	return
+}