添加 WebSocket VPN 接口及用户认证

- 移动 config 包到 internal/config，新增 DatabaseConfig
- 使用 GORM + SQLite 管理用户数据，预留 MySQL 支持
- 新增 internal/model/user.go GORM 用户模型
- 新增 internal/db/db.go 数据库初始化及默认管理员
- 新增 internal/vpn/ WebSocket 鉴权与隧道骨架
- /ws 路径支持用户名+密码鉴权 (bcrypt)
- 心跳保活 + echo 隧道模式

go.sum

@@ -1,3 +1,5 @@
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@@ -9,12 +11,18 @@ github.com/cloudwego/base64x v0.1.6/go.mod h1:OFcloc187FXDaYHvrNIjxSe8ncn0OOM8gE
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@@ -23,6 +31,8 @@ github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJn
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@@ -30,6 +40,14 @@ github.com/goccy/go-yaml v1.19.2/go.mod h1:XBurs7gK8ATbW4ZPGKgcbrY1Br56PdM69F7Lk
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@@ -51,6 +69,9 @@ github.com/quic-go/qpack v0.6.0 h1:g7W+BMYynC1LbYLSqRt8PBg5Tgwxn214ZZR34VIOjz8=
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