init: 毛孩子计划 小程序 + Go 后端 + 内嵌后台

- pets-fe: 微信原生小程序（首页/计划/记录/报告/社区/引导），
  服务端驱动、无假数据；弹层改用 scroll-view，打开时隐藏自定义 tabBar
- pets-be: Gin + GORM(MySQL, sundynix_ 前缀) + MinIO，统一响应/分页，
  微信 code2session 登录，provider-neutral AI(DeepSeek)，go:embed React 后台
- 修复：分段选择类型不匹配（字符串 vs 数字）导致选不中

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pets-be/internal/service/pro.go

@@ -0,0 +1,62 @@
+package service
+
+import (
+	"time"
+
+	"gorm.io/gorm"
+
+	"github.com/sundynix/pets-be/internal/model"
+)
+
+// ProFeatures Pro 权益列表
+var ProFeatures = []string{
+	"365 天养宠计划",
+	"多宠物管理",
+	"月度成长报告",
+	"PDF 健康档案",
+	"年度养宠账单",
+}
+
+// ProInfo Pro 状态 + 权益
+type ProInfo struct {
+	Status    string     `json:"status"`
+	PlanType  string     `json:"plan_type"`
+	Price     float64    `json:"price"`
+	EndDate   *time.Time `json:"end_date"`
+	Features  []string   `json:"features"`
+}
+
+// GetPro 取会员信息
+func (s *Service) GetPro(userID uint) (*ProInfo, error) {
+	var m model.ProMembership
+	err := s.db.Where("user_id = ?", userID).First(&m).Error
+	if err == gorm.ErrRecordNotFound {
+		return &ProInfo{Status: model.ProNone, Features: ProFeatures}, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &ProInfo{Status: m.Status, PlanType: m.PlanType, Price: m.Price, EndDate: m.EndDate, Features: ProFeatures}, nil
+}
+
+// ActivatePro 开通年费会员
+func (s *Service) ActivatePro(userID uint) (*ProInfo, error) {
+	now := time.Now()
+	end := now.AddDate(1, 0, 0)
+	var m model.ProMembership
+	err := s.db.Where("user_id = ?", userID).First(&m).Error
+	if err == gorm.ErrRecordNotFound {
+		m = model.ProMembership{UserID: userID}
+	} else if err != nil {
+		return nil, err
+	}
+	m.Status = model.ProActive
+	m.PlanType = "yearly"
+	m.Price = 29.9
+	m.StartDate = &now
+	m.EndDate = &end
+	if err := s.db.Save(&m).Error; err != nil {
+		return nil, err
+	}
+	return &ProInfo{Status: m.Status, PlanType: m.PlanType, Price: m.Price, EndDate: m.EndDate, Features: ProFeatures}, nil
+}