Fix .NET MAUI AMM0000 Build Error by Raising Android Minimum SDK to 24

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Developers adding Google Play Billing to .NET MAUI apps often encounter a wall of AMM0000 namespace errors that mislead them into chasing the wrong cause. The real build-breaking issue, buried at the bottom of the error output, is a minSdkVersion conflict: the default .NET MAUI template targets API 21, while Google Play Billing's dependency chain via AndroidX and GMS libraries requires API 23 or higher. Raising the Android minimum SDK to 24 in the project's .csproj file resolves the fatal error and causes the namespace warnings to stop being treated as failures. Common workarounds such as cleaning bin/obj folders, downgrading billing packages, or using tools:overrideLibrary do not fix the root cause and may introduce new problems. Setting minSdk to 24 is recommended as it satisfies current library requirements while still covering over 97% of active Android devices.

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