feat: enable R8 minification and upload ReTrace mapping files

- Enable minifyEnabled and shrinkResources for release builds
- Update ProGuard rules with comprehensive library support
- Add rules for Dagger2, ButterKnife, RxJava2, Fruit, and other libraries
- Keep essential classes (BuildConfig, R, data models) but allow code obfuscation
- Use proguard-android-optimize.txt for better optimization

This will:
- Generate mapping.txt file for crash deobfuscation
- Reduce APK/AAB size through code shrinking
- Improve app security through code obfuscation
- Enable upload of ReTrace mapping files to Google Play Console

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: graycreate

app/build.gradle

@@ -37,9 +37,9 @@ android {
         }
 
         release {
-            minifyEnabled false // False for fix of a lot crash in release
-//            shrinkResources true
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            minifyEnabled true
+            shrinkResources true
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
             signingConfig signingConfigs.release
             versionNameSuffix rootProject.ext.app.betaSuffix
         }

app/proguard-rules.pro

@@ -133,4 +133,109 @@
  -keep,allowobfuscation,allowshrinking class io.reactivex.rxjava3.core.Flowable
  -keep,allowobfuscation,allowshrinking class io.reactivex.rxjava3.core.Maybe
  -keep,allowobfuscation,allowshrinking class io.reactivex.rxjava3.core.Observable
- -keep,allowobfuscation,allowshrinking class io.reactivex.rxjava3.core.Single
+ -keep,allowobfuscation,allowshrinking class io.reactivex.rxjava3.core.Single
+
+#----------------- Additional Rules for V2er App ------------------------
+
+# Keep RxJava2 (current version used in app)
+-keep class io.reactivex.** { *; }
+-keep interface io.reactivex.** { *; }
+-dontwarn io.reactivex.**
+
+# Dagger 2 rules
+-dontwarn com.google.errorprone.annotations.**
+-keep class dagger.** { *; }
+-keep class javax.inject.** { *; }
+-keep class * extends dagger.Module
+-keep class * extends dagger.Component
+-keep @dagger.Component class *
+-keep @dagger.Module class * { *; }
+-keep @dagger.Provides class * { *; }
+-keep @javax.inject.Inject class * { *; }
+
+# ButterKnife rules  
+-keep class butterknife.** { *; }
+-dontwarn butterknife.internal.**
+-keep class **$$ViewBinder { *; }
+-keepclasseswithmembernames class * {
+    @butterknife.* <fields>;
+}
+-keepclasseswithmembernames class * {
+    @butterknife.* <methods>;
+}
+
+# Custom Fruit HTML parsing library
+-keep class me.ghui.fruit.** { *; }
+-dontwarn me.ghui.fruit.**
+-keep @me.ghui.fruit.annotations.* class * { *; }
+-keepclasseswithmembernames class * {
+    @me.ghui.fruit.annotations.* <methods>;
+}
+-keepclasseswithmembernames class * {
+    @me.ghui.fruit.annotations.* <fields>;
+}
+
+# RxLifecycle
+-keep class com.trello.rxlifecycle2.** { *; }
+-dontwarn com.trello.rxlifecycle2.**
+
+# Logger library
+-keep class com.orhanobut.logger.** { *; }
+-dontwarn com.orhanobut.logger.**
+
+# Flurry Analytics (referenced in CLAUDE.md)
+-keep class com.flurry.** { *; }
+-dontwarn com.flurry.**
+
+# Sentry (referenced in CLAUDE.md) 
+-keep class io.sentry.** { *; }
+-dontwarn io.sentry.**
+
+# Keep only essential application classes (allow most classes to be obfuscated)
+-keep class me.ghui.v2er.BuildConfig { *; }
+-keep class me.ghui.v2er.R { *; }
+-keep class me.ghui.v2er.R$* { *; }
+
+# Keep Application class and Activities (required by Android)  
+-keep class me.ghui.v2er.Application { *; }
+-keep class * extends android.app.Application { *; }
+
+# Keep data models used for JSON parsing (Gson/Fruit)
+-keep class me.ghui.v2er.network.bean.** { *; }
+
+# Keep classes with native methods
+-keepclasseswithmembernames class * {
+    native <methods>;
+}
+
+# Keep all Activities, Services, BroadcastReceivers
+-keep public class * extends android.app.Activity
+-keep public class * extends android.app.Service
+-keep public class * extends android.content.BroadcastReceiver
+-keep public class * extends android.content.ContentProvider
+
+# Keep view constructors (for layout inflation)
+-keepclasseswithmembers class * {
+    public <init>(android.content.Context, android.util.AttributeSet);
+}
+-keepclasseswithmembers class * {
+    public <init>(android.content.Context, android.util.AttributeSet, int);
+}
+
+# Keep custom views and their constructors
+-keep public class * extends android.view.View {
+    public <init>(android.content.Context);
+    public <init>(android.content.Context, android.util.AttributeSet);
+    public <init>(android.content.Context, android.util.AttributeSet, int);
+}
+
+# Keep Parcelable implementations
+-keepclassmembers class * implements android.os.Parcelable {
+  public static final android.os.Parcelable$Creator CREATOR;
+}
+
+# Keep enums
+-keepclassmembers enum * {
+    public static **[] values();
+    public static ** valueOf(java.lang.String);
+}