🔧 Add ProGuard rules for reflection, WebView, and url_launcher support

[ScreepCode]

This pull request updates the ProGuard rules in the android/app/proguard-rules.pro file to ensure proper functionality of reflection, URL launcher, WebView, and JavaScript interfaces in the Android app. The changes primarily focus on preserving specific classes and methods from being removed or obfuscated during the build process.

ProGuard Rule Updates:

• Reflection Support: Added rules to keep all class members used for reflection to prevent runtime issues. ([android/app/proguard-rules.proR1-R40](https://github.com/ScreepCode/MoveTopia/pull/144/files#diff-09b2c99413460ebb90ea73560bea82a46996111028b6fbab31316433e58d42a8R1-R40))
• URL Launcher: Preserved classes related to the url_launcher package, including androidx.core and io.flutter.plugins.urllauncher classes, to ensure proper functionality. ([android/app/proguard-rules.proR1-R40](https://github.com/ScreepCode/MoveTopia/pull/144/files#diff-09b2c99413460ebb90ea73560bea82a46996111028b6fbab31316433e58d42a8R1-R40))
• WebView and JavaScript Interfaces: Added rules to keep WebView-related classes, JavaScript interfaces, and their methods, ensuring compatibility with WebView and JavaScript interactions. ([android/app/proguard-rules.proR1-R40](https://github.com/ScreepCode/MoveTopia/pull/144/files#diff-09b2c99413460ebb90ea73560bea82a46996111028b6fbab31316433e58d42a8R1-R40))
• Custom Implementations: Preserved all implementations of b2.a, b2.**, and j2.d to maintain compatibility with custom logic. ([android/app/proguard-rules.proR1-R40](https://github.com/ScreepCode/MoveTopia/pull/144/files#diff-09b2c99413460ebb90ea73560bea82a46996111028b6fbab31316433e58d42a8R1-R40))

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