Optimization: Launch Agents list has no enable/disable toggle

[iliyami]

Sources/MacClean/Views/Performance/OptimizationView.swift — the Login Items tab has a working toggle, but the Launch Agents tab (launchAgentsList) renders each agent with no control, so there's no way to disable e.g. 'Zoom at login'. LaunchAgentsManager (Sources/MacClean/Modules/Optimization/OptimizationModule.swift:74) also lacks a toggle method.

Fix: add LaunchAgentsManager.setEnabled(_:enabled:) (load/unload via launchctl or rename plist) + a Toggle in the list, mirroring Login Items. PR 1.

[iliyami]

Resolved by #41 (merged to main as db8264d, 1.6.2).