feat: Add Android static analysis workflow with Jadx, OpenGrep, and MobSF

Comprehensive Android security testing workflow converted from Prefect to Temporal architecture:

Modules (3):
- JadxDecompiler: APK to Java source code decompilation
- OpenGrepAndroid: Static analysis with Android-specific security rules
- MobSFScanner: Comprehensive mobile security framework integration

Custom Rules (13):
- clipboard-sensitive-data, hardcoded-secrets, insecure-data-storage
- insecure-deeplink, insecure-logging, intent-redirection
- sensitive_data_sharedPreferences, sqlite-injection
- vulnerable-activity, vulnerable-content-provider, vulnerable-service
- webview-javascript-enabled, webview-load-arbitrary-url

Workflow:
- 6-phase Temporal workflow: download → Jadx → OpenGrep → MobSF → SARIF → upload
- 4 activities: decompile_with_jadx, scan_with_opengrep, scan_with_mobsf, generate_android_sarif
- SARIF output combining findings from all security tools

Docker Worker:
- ARM64 Mac compatibility via amd64 platform emulation
- Pre-installed: Android SDK, Jadx 1.4.7, OpenGrep 1.45.0, MobSF 3.9.7
- MobSF runs as background service with API key auto-generation
- Added aiohttp for async HTTP communication

Test APKs:
- BeetleBug.apk and shopnest.apk for workflow validation

backend/toolbox/modules/android/__init__.py

@@ -0,0 +1,25 @@
+"""
+Android Security Analysis Modules
+
+Modules for Android application security testing:
+- JadxDecompiler: APK decompilation using Jadx
+- MobSFScanner: Mobile security analysis using MobSF
+- OpenGrepAndroid: Static analysis using OpenGrep/Semgrep with Android-specific rules
+"""
+
+# Copyright (c) 2025 FuzzingLabs
+#
+# Licensed under the Business Source License 1.1 (BSL). See the LICENSE file
+# at the root of this repository for details.
+#
+# After the Change Date (four years from publication), this version of the
+# Licensed Work will be made available under the Apache License, Version 2.0.
+# See the LICENSE-APACHE file or http://www.apache.org/licenses/LICENSE-2.0
+#
+# Additional attribution and requirements are provided in the NOTICE file.
+
+from .jadx_decompiler import JadxDecompiler
+from .mobsf_scanner import MobSFScanner
+from .opengrep_android import OpenGrepAndroid
+
+__all__ = ["JadxDecompiler", "MobSFScanner", "OpenGrepAndroid"]