Plugins: manage individual Windows plugins

[emaspa]

Changes

• List individual Windows VST3/CLAP sources with enabled, disabled and in-use states.
• Disable or restore a source through the selected bridge's exclusion list without deleting its files.
• Delete standalone files only after confirmation. Protect Wine-installed and linked sources, and open Wine's uninstaller in the appropriate prefix instead.
• Rescan after changes and clean missing-source wrappers without touching unrelated or in-use wrappers.
• Add Remove from all chains for in-use plugins. Remove every current occurrence, including bypassed inserts, preserve other plugins and saved profiles, and save before acknowledging. Rewire failures retain the affected definitions; failed saves restore the previous settings.
• Give the folder list more height, expose the operations through the API, and update the manual.

Verification

• Native-enabled Release build with warnings treated as errors: 0 warnings, 0 errors.
• .NET suite: 487 passed, 3 opt-in desktop tests skipped. The separate Xvfb layout check passed at narrow and wide sizes.
• Real yabridge checks in isolated directories verified canonical exclusions, restoration, standalone deletion, sibling preservation, in-use guards and missing-source wrapper cleanup.
• Tests cover multi-chain removal, duplicate and bypassed occurrences, input grouping, rewire failures, save rollback, request serialization, validation and the manager's controls.
• Local deployment confirmed working. Current mixer and window settings were preserved during deployment.

No version bump or release changes. The Elgato EQ lifecycle fix is separate.