Add Discord APKTool decompilation (Smali source for modding)

- Imported from https://github.com/supermegamestre/Project-Real-Resurrection-3
- APKTool decompilation (Smali bytecode) for modding and rebuilding APK
- Supports both 32-bit (armeabi-v7a) and 64-bit (arm64-v8a) architectures
- Includes full Smali source, resources, and native libraries
- Ready to rebuild APK after modifications with apktool b command
- Added comprehensive README-apktool.md with modding guide

This branch complements the JADX branches:
- Use JADX (main/discord-community) to UNDERSTAND code (readable Java)
- Use APKTool (this branch) to MODIFY and REBUILD APK (editable Smali)

Total: 44,417 files, 538.51 MB Smali source code

smali_classes3/com/google/firebase/messaging/threads/PoolableExecutors.smali

@@ -0,0 +1,44 @@
+.class public abstract Lcom/google/firebase/messaging/threads/PoolableExecutors;
+.super Ljava/lang/Object;
+.source "SourceFile"
+
+
+# annotations
+.annotation system Ldalvik/annotation/MemberClasses;
+    value = {
+        Lcom/google/firebase/messaging/threads/PoolableExecutors$DefaultExecutorFactory;
+    }
+.end annotation
+
+
+# static fields
+.field public static final DEFAULT_INSTANCE:Lcom/google/firebase/messaging/threads/ExecutorFactory;
+
+.field public static volatile instance:Lcom/google/firebase/messaging/threads/ExecutorFactory;
+
+
+# direct methods
+.method static constructor <clinit>()V
+    .locals 2
+
+    .line 39
+    new-instance v0, Lcom/google/firebase/messaging/threads/PoolableExecutors$DefaultExecutorFactory;
+
+    const/4 v1, 0x0
+
+    invoke-direct {v0, v1}, Lcom/google/firebase/messaging/threads/PoolableExecutors$DefaultExecutorFactory;-><init>(Lcom/google/firebase/messaging/threads/PoolableExecutors$1;)V
+
+    sput-object v0, Lcom/google/firebase/messaging/threads/PoolableExecutors;->DEFAULT_INSTANCE:Lcom/google/firebase/messaging/threads/ExecutorFactory;
+
+    sput-object v0, Lcom/google/firebase/messaging/threads/PoolableExecutors;->instance:Lcom/google/firebase/messaging/threads/ExecutorFactory;
+
+    return-void
+.end method
+
+.method public static factory()Lcom/google/firebase/messaging/threads/ExecutorFactory;
+    .locals 1
+
+    sget-object v0, Lcom/google/firebase/messaging/threads/PoolableExecutors;->instance:Lcom/google/firebase/messaging/threads/ExecutorFactory;
+
+    return-object v0
+.end method