Feature/google store

[Lakritzator]

Working on a store version of the app.

[gemini-code-assist]

Code Review

This pull request introduces trial limitations and a personal reading statistics dashboard for StripWolf, including a new TrialService, AppEventsService, and database-backed usage logging. It also configures Android backup rules and adds premium unlock UI overlays. The review feedback highlights several critical improvements: securing credentials by excluding the encryption key from backups, wrapping the async void event handler OnComicOpened in a try-catch block to prevent crashes, and marshalling the PremiumUnlockRequested event to the UI thread to avoid threading exceptions. Additionally, the reviewer recommends registering IBillingService in the DI container, optimizing format checks using a static HashSet to reduce allocations, removing a redundant database index, fixing encoding corruption in several translation files, and correcting a typo in the Dutch localization.

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