Add LaunchBox parity workflows to the Web UI

[vindeckyy]

What changed

• Add advanced search syntax, ordered manual playlists, context actions, Ctrl and Shift selection, configurable badges, collection details, rich related games, expanded artwork groups, backup management, and per-game launch profile overrides.
• Harden backend persistence, jobs, I/O validation, restore paths, and packaging metadata.
• Add API and launch-profile regression coverage plus release and parity documentation.

Verification

• ./run_all_tests.sh
• Python compilation
• Web UI JavaScript syntax check
• Chromium smoke test with no page errors

Release target: v0.6.0.

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