build(android): integrate Google Services plugin for Firebase support

Add Google Services Gradle plugin integration to withHuaweiPush.js to enable Firebase initialization alongside Huawei Push. This includes:
- Adding google-services classpath dependency for buildscript
- Applying com.google.gms.google-services plugin after React plugin
- Copying google-services.json to android/app/ for runtime initialization

Without these changes, Firebase initialization fails at runtime with "default FirebaseApp is not initialized" when google-services.json is configured in app.json.

.claude/settings.local.json

@@ -3,7 +3,8 @@
     "allow": [
       "Bash(python -c \"import sys,json; d=json.load\\(sys.stdin\\); deps={**d.get\\('dependencies',{}\\), **d.get\\('devDependencies',{}\\)}; [print\\(f'{k}: {v}'\\) for k,v in deps.items\\(\\) if 'navigation' in k or 'tab' in k.lower\\(\\)]\")",
       "Bash(npx tsc *)",
-      "Bash(echo \"EXIT: $?\")"
+      "Bash(echo \"EXIT: $?\")",
+      "Bash(npm view *)"
     ]
   }
 }