feat(drivers): add emby driver

[Akizon77]

Description / 描述

Motivation and Context / 背景

Closes #XXXX

Relates to #XXXX

How Has This Been Tested? / 测试

Checklist / 检查清单

• I have read the CONTRIBUTING document.
  我已阅读 CONTRIBUTING 文档。
• I have formatted my code with go fmt or prettier.
  我已使用 go fmt 或 prettier 格式化提交的代码。
• I have added appropriate labels to this PR (or mentioned needed labels in the description if lacking permissions).
  我已为此 PR 添加了适当的标签（如无权限或需要的标签不存在，请在描述中说明，管理员将后续处理）。
• I have requested review from relevant code authors using the "Request review" feature when applicable.
  我已在适当情况下使用"Request review"功能请求相关代码作者进行审查。
• I have updated the repository accordingly (If it’s needed).
  我已相应更新了相关仓库（若适用）。
  • OpenList-Frontend #XXXX
  • docs(driver): add emby driver documentation OpenList-Docs#318

[Copilot]

Pull request overview

Adds a new Emby storage driver to OpenList, enabling browsing Emby libraries and generating stream/download links.

Changes:

• Introduces an emby driver implementing Init, List, and Link with Emby authentication support.
• Adds Emby API request/response types and helper utilities for login and item listing.
• Registers the new driver and wires it into the global drivers import list.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
drivers/emby/driver.go	Core Emby driver implementation (init, list, link generation).
drivers/emby/util.go	Emby HTTP helpers for authentication and item listing.
drivers/emby/types.go	Request/response structs for Emby API interactions.
drivers/emby/meta.go	Driver config + registration.
drivers/all.go	Adds blank import to include the Emby driver in builds.

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