Add Android node foundation with FCM push support

src/gateway/protocol.ts

@@ -46,7 +46,7 @@ export interface NodeStatusSetParams {
 
 export interface NodePushTokenSetParams {
   connectionId: string;
-  provider: 'apns';
+  provider: 'apns' | 'fcm';
   token: string;
   topic?: string;
   environment?: 'sandbox' | 'production';
@@ -309,7 +309,7 @@ export function parseNodePushTokenSetParams(params: unknown): NodePushTokenSetPa
   if (typeof p.connectionId !== 'string' || !p.connectionId.trim()) {
     return null;
   }
-  if (p.provider !== 'apns') {
+  if (p.provider !== 'apns' && p.provider !== 'fcm') {
     return null;
   }
   if (typeof p.token !== 'string' || p.token.trim().length < 16) {
@@ -324,7 +324,7 @@ export function parseNodePushTokenSetParams(params: unknown): NodePushTokenSetPa
 
   return {
     connectionId: p.connectionId,
-    provider: 'apns',
+    provider: p.provider,
     token: p.token.trim(),
     topic: typeof p.topic === 'string' ? p.topic.trim() : undefined,
     environment: p.environment as NodePushTokenSetParams['environment'] | undefined,