Add iOS node push-token registration foundation

src/gateway/handlers/handlers.test.ts

@@ -926,6 +926,9 @@ describe('config handlers', () => {
           location: {
             enabled: false,
           },
+          push: {
+            enabled: false,
+          },
         },
       },
       models: {
@@ -964,13 +967,14 @@ describe('config handlers', () => {
           'server.queue.mode': 'followup',
           'server.queue.debounce_ms': 100,
           'server.nodes.location.enabled': true,
+          'server.nodes.push.enabled': true,
         },
       },
     };
     const result = await handlers['config.patch'](req) as GatewayResponse;
 
     const r = result.result as { applied: string[]; rejected: string[]; persisted: boolean };
-    expect(r.applied).toEqual(['hooks.confirm', 'hooks.log', 'server.queue.mode', 'server.queue.debounce_ms', 'server.nodes.location.enabled']);
+    expect(r.applied).toEqual(['hooks.confirm', 'hooks.log', 'server.queue.mode', 'server.queue.debounce_ms', 'server.nodes.location.enabled', 'server.nodes.push.enabled']);
     expect(r.rejected).toEqual([]);
     expect(r.persisted).toBe(false);
     // Verify the config was actually mutated
@@ -979,6 +983,7 @@ describe('config handlers', () => {
     expect(config.server.queue.mode).toBe('followup');
     expect(config.server.queue.debounce_ms).toBe(100);
     expect(config.server.nodes.location.enabled).toBe(true);
+    expect(config.server.nodes.push.enabled).toBe(true);
   });
 
   it('config.patch rejects unknown keys', async () => {