feat(auth): 添加 Refresh Token 双 Token 机制

- 添加 /api/refresh-token 接口支持 Token 续期
- 登录接口返回 access_token 和 refresh_token
- 新增 refresh_tokens 表存储 refresh_token
- 部署脚本添加数据库备份和迁移功能
- deploy.sh 添加 4 项 API 测试
- 更新 AGENTS.md 文档

src/handlers/mod.rs

@@ -3,6 +3,7 @@ pub mod admin;
 pub mod auth;
 pub mod favorites;
 pub mod health;
+pub mod meta;
 pub mod payment;
 pub mod static_files;
 pub mod user;
@@ -17,8 +18,10 @@ pub static TEMPLATES_DIR: Dir = include_dir!("$CARGO_MANIFEST_DIR/templates");
 pub use admin::admin_get_user;
 pub use admin::admin_update_user_payment;
 pub use auth::login;
+pub use auth::refresh_token;
 pub use favorites::{add_favorite, get_favorites, remove_favorite};
 pub use health::health_check;
+pub use meta::root;
 pub use static_files::serve_static_files;
 pub use user::get_current_user_profile;
 pub use user::save_user_profile;