Release v2.1.1: Privileged Uninstaller Fix, System Maintenance & Version SoT

[AlexTkDev]

Summary

• App Uninstaller: Fixed root-owned /Applications deletion failures by implementing batched privileged execution via PrivilegedTaskRunner (exactly 1 password prompt per operation) and added real-time progress spinners.
• System Maintenance: Added Touch ID for sudo terminal command helper with instant status checking, and one-click Spotlight index reindexing (sudo mdutil -E -i on /).
• Version SoT: Set project.yml (MARKETING_VERSION: 2.1.1) as the single source of truth; removed hardcoded fallback versions from SwiftUI views.
• Localization: Updated all 10 supported languages with 100% key parity.
• Documentation: Updated README.md and plan.md to reflect new features and current project status.

Related issue (optional)

Closes #12

Testing performed

• Verified privileged uninstallation for root-owned applications in /Applications.
• Tested Touch ID sudo_local setup flow, clipboard copying, and status verification.
• Verified Spotlight index rebuild trigger (mdutil -E).
• Tested across light and dark modes with full localization checks (all 10 languages).
• Validated build and project generation via xcodegen generate.

Checklist

• Builds successfully
• Tested locally
• Documentation updated (if needed)
• No unrelated changes included