fix: use dynamic ndkVersion in android/build.gradle

[aryaminus]

Summary

• Update android/build.gradle to set ndkVersion dynamically using getExtOrDefault("ndkVersion").

Motivation

Instead of hardcoding the NDK version or relying on defaults, this change allows the ndkVersion to be defined in the root project or gradle.properties, ensuring consistency across the workspace and matching the environment configuration (e.g., 27.1.12297006). This aligns with how other versions like minSdkVersion are handled.

[Copilot]

Pull request overview

This PR makes the NDK version configurable by using the getExtOrDefault() helper function, allowing it to be defined dynamically through rootProject.ext.ndkVersion or via gradle.properties (Cactus_ndkVersion). This aligns with the existing pattern used for other configuration values like kotlinVersion, and ensures the NDK version can be consistently managed across the workspace rather than being hardcoded or left to Android's defaults.

Key Changes:

• Adds dynamic ndkVersion configuration using the existing getExtOrDefault() helper, following the established pattern for string-based version properties

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