feat(server-go): 微信订阅消息骨架（#11，绑定/订阅/巡检触发，配置占位）

server-go/internal/database/db.go

@@ -30,6 +30,7 @@ func Init(cfg *config.Config) error {
 		&model.Disease{}, &model.KnowledgeArticle{},
 		&model.InspectionRecord{},
 		&model.Tray{}, &model.Batch{}, &model.RearingRecord{},
+		&model.WechatBinding{},
 	); err != nil {
 		slog.Warn("自动迁移有警告（可忽略）", "err", err)
 	}