Add comprehensive messenger features and improvements

- Backend improvements: flexible user authentication, nullable fields
- Frontend enhancements: new screens (NewMessage, UserInfo), improved UI/UX
- Chat functionality: real-time messaging with polling, message actions
- Visual upgrades: gradient backgrounds, better themes, modern design
- Added project documentation (CLAUDE.md) and development guidelines

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/services/apollo-client.ts

@@ -1,7 +1,10 @@
-import { ApolloClient, InMemoryCache, createHttpLink, ApolloLink } from '@apollo/client';
+import { ApolloClient, InMemoryCache, createHttpLink, ApolloLink, split } from '@apollo/client';
 import { setContext } from '@apollo/client/link/context';
+import { getMainDefinition } from '@apollo/client/utilities';
+import { GraphQLWsLink } from '@apollo/client/link/subscriptions';
+import { createClient } from 'graphql-ws';
 import AsyncStorage from '@react-native-async-storage/async-storage';
-import { API_URL } from '../config/api';
+import { API_URL, DEV_SERVER_IP } from '../config/api';
 
 const httpLink = createHttpLink({
   uri: API_URL,
@@ -17,6 +20,41 @@ const authLink = setContext(async (_, { headers }) => {
   };
 });
 
+// WebSocket линк для подписок
+const wsLink = new GraphQLWsLink(createClient({
+  url: API_URL.replace('http://', 'ws://'),
+  connectionParams: () => {
+    return new Promise(async (resolve) => {
+      try {
+        const token = await AsyncStorage.getItem('token');
+        resolve({
+          authorization: token ? `Bearer ${token}` : '',
+        });
+      } catch (error) {
+        console.error('Error getting token for WebSocket:', error);
+        resolve({
+          authorization: '',
+        });
+      }
+    });
+  },
+  retryAttempts: 5,
+  retryWait: (attempt) => Math.min(1000 * Math.pow(2, attempt), 10000),
+}));
+
+// Временно используем только HTTP линк, пока не настроим WebSocket
+// const splitLink = split(
+//   ({ query }) => {
+//     const definition = getMainDefinition(query);
+//     return (
+//       definition.kind === 'OperationDefinition' &&
+//       definition.operation === 'subscription'
+//     );
+//   },
+//   wsLink,
+//   ApolloLink.from([authLink, httpLink])
+// );
+
 export const apolloClient = new ApolloClient({
   link: ApolloLink.from([authLink, httpLink]),
   cache: new InMemoryCache(),