feat: AUS Perps Watchlist

[gambinish]

Explanation

Persists state.watchlistMarkets to AUS so the watchlist follows the user across devices and clients, rather than being device-local only.

What changed

• toggleWatchlistMarket now performs an optimistic local update first (UI is instant), then syncs to AUS. If the remote write fails, local state is reverted.
• On init(), the controller hydrates state.watchlistMarkets from AUS. AUS is the source of truth; local state acts as an offline cache (persist: true unchanged).
• One-time migration: if a user already has local markets saved but no AUS record yet, those are pushed up automatically on first init.
• Falls back to local-only silently when unauthenticated or when the active provider has no AUS mapping (e.g. aggregated).
• Adds resolveWatchlistExchangeKey() — the single extension point for adding future DEX providers to AUS sync.
  Integration (client PRs)

Each client needs to grant the PerpsController messenger two new allowed actions:

• AuthenticatedUserStorageService:getNotificationPreferences
• AuthenticatedUserStorageService:putNotificationPreferences

No other wiring needed — AuthenticatedUserStorageService is already running wherever NotificationServicesController is wired, and AuthenticationController:getBearerToken was already allowed.

References

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've communicated my changes to consumers by updating changelogs for packages I've changed
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them

[gambinish]

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