补齐 HTTP 层：实现用户模块、路由与中间件接线、COS 上传及优雅启动

- 新增用户与上传错误码文件及 Recovery 中间件
- 修复 router.go 导入与中间件链，注册用户路由并补 handler 错误码导入
- 补充用户状态常量与 UserGetByWechatOpenID 查询，修订刷新令牌 dto
- 移除 upload 包 OTel 调用，新增 FileUploadCos 上传封装
- 实现 UserService 微信登录/刷新令牌/我的信息/改资料/上传头像
- 裁剪 main.go 配置段并移除 OTel 桥接，补启动与优雅退出
- 新增 configs 示例配置、global 配置结构及 go.mod 依赖

global/cos.go

@@ -0,0 +1,7 @@
+package global
+
+import "github.com/tencentyun/cos-go-sdk-v5"
+
+var (
+	CosClient *cos.Client
+)

global/mysql.go

@@ -0,0 +1,5 @@
+package global
+
+import "gorm.io/gorm"
+
+var MysqlEngine *gorm.DB

global/redis.go

@@ -0,0 +1,5 @@
+package global
+
+import "github.com/redis/go-redis/v9"
+
+var RedisEngine *redis.Client

global/setting.go

@@ -0,0 +1,14 @@
+package global
+
+import "git.lzcwy.cn/zhengchiliu/zt-online-game-backend/pkg/setting"
+
+var (
+	ServerSetting     *setting.ServerSettingS
+	LogSetting        *setting.LogSettingS
+	MysqlSetting      *setting.MysqlSettingS
+	RedisSetting      *setting.RedisSettingS
+	JWTSetting        *setting.JWTSettingS
+	UploadSetting     *setting.UploadSettingS
+	CosSetting        *setting.CosSettingS
+	WechatMiniSetting *setting.WechatMiniSettingS
+)