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/ui/settings/ProfileScreen.kt

@@ -3,7 +3,10 @@ package com.rosetta.messenger.ui.settings
 import android.content.ClipData
 import android.content.ClipboardManager
 import android.content.Context
+import android.net.Uri
 import android.util.Log
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.animation.*
 import androidx.compose.animation.core.*
 import androidx.compose.foundation.*
@@ -47,9 +50,14 @@ import androidx.fragment.app.FragmentActivity
 import com.rosetta.messenger.biometric.BiometricAuthManager
 import com.rosetta.messenger.biometric.BiometricAvailability
 import com.rosetta.messenger.biometric.BiometricPreferences
+import com.rosetta.messenger.repository.AvatarRepository
+import com.rosetta.messenger.utils.AvatarFileManager
+import com.rosetta.messenger.ui.components.AvatarImage
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
 import kotlin.math.roundToInt
 
 private const val TAG = "ProfileScreen"
@@ -135,7 +143,8 @@ fun ProfileScreen(
     onNavigateToTheme: () -> Unit = {},
     onNavigateToSafety: () -> Unit = {},
     onNavigateToLogs: () -> Unit = {},
-    viewModel: ProfileViewModel = androidx.lifecycle.viewmodel.compose.viewModel()
+    viewModel: ProfileViewModel = androidx.lifecycle.viewmodel.compose.viewModel(),
+    avatarRepository: AvatarRepository? = null
 ) {
     val context = LocalContext.current
     val activity = context as? FragmentActivity
@@ -156,6 +165,46 @@ fun ProfileScreen(
     // Состояние меню аватара для установки фото профиля
     var showAvatarMenu by remember { mutableStateOf(false) }
     
+    // Image picker launcher для выбора аватара
+    val imagePickerLauncher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.GetContent()
+    ) { uri: Uri? ->
+        uri?.let {
+            scope.launch {
+                try {
+                    // Читаем файл изображения
+                    val inputStream = context.contentResolver.openInputStream(uri)
+                    val imageBytes = inputStream?.readBytes()
+                    inputStream?.close()
+                    
+                    if (imageBytes != null) {
+                        // Конвертируем в PNG Base64 (кросс-платформенная совместимость)
+                        val base64Png = withContext(Dispatchers.IO) {
+                            AvatarFileManager.imagePrepareForNetworkTransfer(context, imageBytes)
+                        }
+                        
+                        // Сохраняем аватар через репозиторий
+                        avatarRepository?.changeMyAvatar(base64Png)
+                        
+                        // Показываем успешное сообщение
+                        android.widget.Toast.makeText(
+                            context,
+                            "Avatar updated successfully",
+                            android.widget.Toast.LENGTH_SHORT
+                        ).show()
+                    }
+                } catch (e: Exception) {
+                    Log.e(TAG, "Failed to upload avatar", e)
+                    android.widget.Toast.makeText(
+                        context,
+                        "Failed to update avatar: ${e.message}",
+                        android.widget.Toast.LENGTH_LONG
+                    ).show()
+                }
+            }
+        }
+    }
+    
     // Цвета в зависимости от темы
     val backgroundColor = if (isDarkTheme) Color(0xFF1A1A1A) else Color(0xFFFFFFFF)
     val surfaceColor = if (isDarkTheme) Color(0xFF2C2C2E) else Color(0xFFF2F2F7)
@@ -402,7 +451,11 @@ fun ProfileScreen(
             },
             isDarkTheme = isDarkTheme,
             showAvatarMenu = showAvatarMenu,
-            onAvatarMenuChange = { showAvatarMenu = it }
+            onAvatarMenuChange = { showAvatarMenu = it },
+            onSetPhotoClick = {
+                imagePickerLauncher.launch("image/*")
+            },
+            avatarRepository = avatarRepository
         )
     }
 }
@@ -422,7 +475,9 @@ private fun CollapsingProfileHeader(
     onSave: () -> Unit,
     isDarkTheme: Boolean,
     showAvatarMenu: Boolean,
-    onAvatarMenuChange: (Boolean) -> Unit
+    onAvatarMenuChange: (Boolean) -> Unit,
+    onSetPhotoClick: () -> Unit,
+    avatarRepository: AvatarRepository?
 ) {
     val density = LocalDensity.current
     val configuration = LocalConfiguration.current
@@ -522,13 +577,13 @@ private fun CollapsingProfileHeader(
                 isDarkTheme = isDarkTheme,
                 onSetPhotoClick = {
                     onAvatarMenuChange(false)
-                    // TODO: Реализовать выбор фото профиля
+                    onSetPhotoClick()
                 }
             )
         }
         
         // ═══════════════════════════════════════════════════════════
-        // 👤 AVATAR - shrinks and moves up
+        // 👤 AVATAR - shrinks and moves up (with real avatar support)
         // ═══════════════════════════════════════════════════════════
         if (avatarSize > 1.dp) {
             Box(
@@ -541,17 +596,36 @@ private fun CollapsingProfileHeader(
                     .clip(CircleShape)
                     .background(Color.White.copy(alpha = 0.15f))
                     .padding(2.dp)
-                    .clip(CircleShape)
-                    .background(avatarColors.backgroundColor),
+                    .clip(CircleShape),
                 contentAlignment = Alignment.Center
             ) {
-                if (avatarFontSize > 1.sp) {
-                    Text(
-                        text = getInitials(name),
-                        fontSize = avatarFontSize,
-                        fontWeight = FontWeight.Bold,
-                        color = avatarColors.textColor
+                // Используем AvatarImage если репозиторий доступен
+                if (avatarRepository != null) {
+                    AvatarImage(
+                        publicKey = publicKey,
+                        avatarRepository = avatarRepository,
+                        size = avatarSize - 4.dp,
+                        isDarkTheme = false, // Header всегда светлый на цветном фоне
+                        onClick = null,
+                        showOnlineIndicator = false
                     )
+                } else {
+                    // Fallback: цветной placeholder с инициалами
+                    Box(
+                        modifier = Modifier
+                            .fillMaxSize()
+                            .background(avatarColors.backgroundColor),
+                        contentAlignment = Alignment.Center
+                    ) {
+                        if (avatarFontSize > 1.sp) {
+                            Text(
+                                text = getInitials(name),
+                                fontSize = avatarFontSize,
+                                fontWeight = FontWeight.Bold,
+                                color = avatarColors.textColor
+                            )
+                        }
+                    }
                 }
             }
         }