feat: slogan-agent MVP 服务端完整实现

- 用户域：注册/登录(JWT)/修改密码/个人资料
- 照片/衣橱/身形/化身：上传存储 + 3D 化身模板匹配
- 穿搭生成：天气(高德+和风+缓存) → 规则预筛 → LLM 规划(1次调用)
  → 规则评分(5维100分制) → 全低分触发 LLM 兜底创作 → 异步任务状态机
- 效果图：选主方案后异步生成 3 视角(mock/wanx 供应商 + 内容 hash 缓存 + 每日限额)
- 商业化：合作门店列表(seed 4 家)
- 冒烟：全链路端到端验证通过(mock LLM/天气)，23 个 API 端点

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

styleagent/controller/user_controller.go

@@ -0,0 +1,47 @@
+package controller
+
+import (
+	"context"
+
+	"slogan-agent/common"
+	"slogan-agent/styleagent/dao"
+	"slogan-agent/styleagent/model/dto"
+	"slogan-agent/styleagent/service"
+
+	"github.com/gogf/gf/v2/frame/g"
+)
+
+type user struct{}
+
+var User = new(user)
+
+func (c *user) Register(ctx context.Context, req *dto.RegisterReq) (res *struct{}, err error) {
+	_, err = service.UserService.Register(ctx, req.Account, req.Password, req.Name)
+	if err != nil {
+		return nil, err
+	}
+	return &struct{}{}, nil
+}
+
+func (c *user) Login(ctx context.Context, req *dto.LoginReq) (res *dto.LoginRes, err error) {
+	user, token, err := service.UserService.Login(ctx, req.Account, req.Password)
+	if err != nil {
+		return nil, err
+	}
+	return &dto.LoginRes{
+		Token: token,
+		User:  &dto.LoginUser{Id: user.Id, Role: user.Role, Name: user.Name},
+	}, nil
+}
+
+func (c *user) ChangePassword(ctx context.Context, req *dto.ChangePasswordReq) (res *struct{}, err error) {
+	return nil, service.UserService.ChangePassword(ctx, common.GetUserId(g.RequestFromCtx(ctx)), req.OldPassword, req.NewPassword)
+}
+
+func (c *user) Profile(ctx context.Context, req *struct{}) (res *dto.ProfileRes, err error) {
+	user, err := dao.User.GetOne(ctx, common.GetUserId(g.RequestFromCtx(ctx)))
+	if err != nil || user == nil {
+		return nil, err
+	}
+	return &dto.ProfileRes{Id: user.Id, Role: user.Role, Name: user.Name, Username: user.Username, Phone: user.Phone}, nil
+}