chore(deps): remove unimplemented FUSE mount functionality and dependencies

[jjm2473]

FUSE was introduced years ago but never implemented, let's remove it to reduce dependencies.

Summary / 摘要

减少依赖，减少问题。 sbwml/luci-app-openlist2#29

internal/fuse 存在多年，但从未有人实现它，反而引入依赖问题。

• This PR has breaking changes.
  / 此 PR 包含破坏性变更。
• This PR changes public API, config, storage format, or migration behavior.
  / 此 PR 修改了公开 API、配置、存储格式或迁移行为。
• This PR requires corresponding changes in related repositories.
  / 此 PR 需要关联仓库同步修改。

Related repository PRs / 关联仓库 PR:

• OpenList-Frontend:
• OpenList-Docs:

Related Issues / 关联 Issue

Testing / 测试

• go test ./...
• Manual test / 手动测试:

Checklist / 检查清单

• I have read CONTRIBUTING.
  / 我已阅读 CONTRIBUTING。
• I confirm this contribution follows the repository license, contribution policy, and code of conduct.
  / 我确认此贡献符合仓库许可证、贡献规范和行为准则。
• I have formatted the changed code with gofmt, go fmt, or prettier where applicable.
  / 我已按适用情况使用 gofmt、go fmt 或 prettier 格式化变更代码。
• I have requested review from relevant maintainers or code owners where applicable.
  / 我已在适用情况下请求相关维护者或代码所有者审查。

[xrgzs]

@jjm2473 可不可以给 https://github.com/OpenListTeam/OpenList-OpenWRT 也来个pr

[jjm2473]

@xrgzs openlist-openwrt是下游，等这个合并以后，下游删掉fuse有关的依赖就行（BUILD_DEPENDS里都不需要了），包括README中的编译说明。