feat(core): add Go and C/C++ compiler cache presets

[coldhighsun]

Summary

• Add two built-in Temp & Caches presets:
  • Go: GOCACHE -> go-build, GOMODCACHE -> go-mod (2 GiB suggested)
  • C/C++ compiler caches: CCACHE_DIR -> ccache, SCCACHE_DIR -> sccache (2 GiB suggested)
• Add English and Simplified Chinese names and descriptions, and update the preset lists in the README.
• Both presets redirect environment variables, so like the existing ones they can live on one disk only, and the previous values are restored on unmount, exit, crash recovery or when the preset is unticked.

Presets are pure data: every consumer (create/edit dialog, context menu, CLI, restore groups, badge tracker, profile ids) iterates BuiltInPresets.All, so no logic changes were needed. Existing presets are unchanged, so existing disks are still detected as before.

Deliberately not included

• Rust (CARGO_TARGET_DIR): it is a build output directory shared by every workspace, not a cache, and the default size would be too small.
• Gradle (GRADLE_USER_HOME): it also holds gradle.properties and init scripts, which would silently disappear while redirected.
• Maven: there is no environment variable for the local repository.

Test plan

• dotnet build (no warnings or errors)
• dotnet test tests/ManagedDrive.Tests (1816 passed)
• New tests: preset contents, composition (capacity, label, folders, variables), detection, active detection, release, and restore grouping
• Manual check in the app: tick the new presets in Create Disk and in the disk context menu, in both languages

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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