feat: export appid binary wrapper and inject via systemd environment generator

[wrj97-alt]

概述

在安装/升级 app 类型的玲珑包时，向 entries/bin 导出一个与 appid 同名的可执行 wrapper（exec ll-cli run <APPID> -- <command...> "$@"），并通过 systemd 环境生成器把 entries/bin 追加进 PATH，使宿主可直接运行导出的命令。

主要改动

1. 二进制 wrapper 导出与生命周期（ostree_repo）

• 导出：exportAppBinaries 生成真实脚本 entries/bin/apps/<APPID>/bin/<APPID>，并在 entries/bin 下建立指向它的相对符号链接；内容取完整 command 数组。创建为幂等 upsert（内容相同为 no-op，不同则覆盖）。
• 模块归属：wrapper 固定由 binary 模块导出，非 binary 模块（如 develop）不创建、不覆盖。
• 空 command 清理：层升级为无 command 版本时，删除上一版本残留的 wrapper 与脚本目录（与 unexport 清理一致，含单测覆盖）。
• 卸载：unexportAppEntries 仅在应用最后一个未删除 layer 被移除时清理 wrapper，升级/模块级卸载时保留。
• 目录稳定性：清理空目录时保留顶层 entries/bin、entries/share（环境注入引用它们）。
• 目录创建：entries/bin/apps/<APPID>/bin 与 entries/share 由导出逻辑（createBinaryWrapperScript / exportAppBinaries）自行创建，不再依赖 tmpfiles 预建。
• LINGLONG_EXPORT_VERSION 升至 1.0.0.5 以触发现有安装重新导出。

2. 环境注入（misc/）

• 还原环境导出文件到 master 布局：移除 user-environment-generators/61-linglong 与 profile.d 的 PATH 注入；在 system-environment-generators/61-linglong 的 master 形态基础上直接追加 PATH 导出（追加不前置、目录存在才注入、去重），同时保持输出 XDG_DATA_DIRS。

测试

• 新增 exporter 相关单测（空 command 清理、非 binary 模块跳过、幂等 upsert、卸载保留/清理等）。
• 本地 ctest：745/745 通过；pre-commit 通过。

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[codecov]

Codecov Report

❌ Patch coverage is 54.83871% with 56 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
libs/linglong/src/linglong/repo/ostree_repo.cpp	54.83%	26 Missing and 30 partials ⚠️

Files with missing lines	Coverage Δ
libs/linglong/src/linglong/repo/ostree_repo.h	8.33% <ø> (ø)
libs/linglong/src/linglong/repo/ostree_repo.cpp	41.78% <54.83%> (+1.15%)	⬆️

... and 10 files with indirect coverage changes

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