feat: ludusavi fallback for steam cloud save issues

[xXJSONDeruloXx]

WIP, currently this is probably too complex for its own good

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Summary by cubic

Adds a Ludusavi-based fallback for Steam cloud save detection. If Steam UFS data is missing or wrong—or the user opts in—the app fetches and caches the Ludusavi manifest and maps its paths to sync saves reliably.

• New Features

  • LudusaviService: downloads manifest from GitHub, caches it in Room (7 days), and extracts save patterns per Steam app.
  • Fallback logic in SteamAutoCloud: uses Ludusavi when no UFS patterns, for known broken titles, or when “Prefer Ludusavi” is enabled.
  • Path mapping for Ludusavi placeholders to existing SaveFilePattern and PathType.
  • “Prefer Ludusavi Manifest” toggle in Container settings; persisted in Container config and Prefs, and passed through SteamService calls.
  • Known broken games list to force Ludusavi for specific apps (e.g., Cult of the Lamb, Monster Sanctuary).

• Migration

  • Room schema bumped to v13; adds ludusavi_manifest_cache table (auto-migration included).

^{Written for commit ddfdb43. Summary will update on new commits.}

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