Replace proprietary dependencies with open source

[CharlVS]

Replace Firebase analytics with Matomo to comply with F-Droid open-source requirements.

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[cursor]

Bug: Matomo Analytics Ignores User Opt-Out

The MatomoAnalyticsRepo fails to properly enforce user analytics opt-out preferences. Unlike the previous Firebase implementation which disabled collection at the SDK level via setAnalyticsCollectionEnabled(false), the current Matomo integration does not call MatomoTracker.instance.setOptOut(true) when analytics are deactivated. This allows direct calls to sendData to bypass the internal _isEnabled check and transmit analytics events even when the user has opted out, leading to a privacy violation.

Additional Locations (1)

• lib/bloc/analytics/analytics_repo.dart#L223-L257