feat: Implement avatar management system with P2P delivery

- Added AvatarRepository for handling avatar storage, retrieval, and delivery.
- Created AvatarCacheEntity and AvatarDeliveryEntity for database storage.
- Introduced PacketAvatar for P2P avatar transfer between clients.
- Enhanced RosettaDatabase to include avatar-related tables and migration.
- Developed AvatarFileManager for file operations related to avatars.
- Implemented AvatarImage composable for displaying user avatars.
- Updated ProfileScreen to support avatar selection and updating.
- Added functionality for handling incoming avatar packets in ProtocolManager.

app/src/main/java/com/rosetta/messenger/MainActivity.kt

@@ -28,6 +28,8 @@ import com.rosetta.messenger.data.AccountManager
 import com.rosetta.messenger.data.DecryptedAccount
 import com.rosetta.messenger.data.PreferencesManager
 import com.rosetta.messenger.data.RecentSearchesManager
+import com.rosetta.messenger.database.RosettaDatabase
+import com.rosetta.messenger.repository.AvatarRepository
 import com.rosetta.messenger.network.PacketPushNotification
 import com.rosetta.messenger.network.ProtocolManager
 import com.rosetta.messenger.network.ProtocolState
@@ -513,6 +515,22 @@ fun MainScreen(
     val profileViewModel: com.rosetta.messenger.ui.settings.ProfileViewModel = androidx.lifecycle.viewmodel.compose.viewModel()
     val profileState by profileViewModel.state.collectAsState()
     
+    // AvatarRepository для работы с аватарами
+    val avatarRepository = remember(accountPublicKey, accountPrivateKey) {
+        if (accountPublicKey.isNotBlank() && accountPublicKey != "04c266b98ae5") {
+            val database = RosettaDatabase.getDatabase(context)
+            AvatarRepository(
+                context = context,
+                avatarDao = database.avatarDao(),
+                currentPublicKey = accountPublicKey,
+                currentPrivateKey = accountPrivateKey,
+                protocolManager = ProtocolManager
+            )
+        } else {
+            null
+        }
+    }
+    
     // Coroutine scope for profile updates
     val mainScreenScope = rememberCoroutineScope()
 
@@ -763,7 +781,8 @@ fun MainScreen(
                             showProfileScreen = false
                             showLogsScreen = true
                         },
-                        viewModel = profileViewModel
+                        viewModel = profileViewModel,
+                        avatarRepository = avatarRepository
                 )
             }
         }