fix: 修复 Telegram 推送消息对齐问题和自动生成账户名

- 修复 Telegram 订单成功/失败消息的左对齐问题，移除前导空格
- 在导入钱包时，如果未提供账户名，自动生成使用钱包地址后四位的名称
- 优化消息格式，确保在 Telegram 中正确显示

backend/src/main/kotlin/com/wrbug/polymarketbot/service/AccountService.kt

@@ -111,7 +111,25 @@ class AccountService(
             val encryptedApiSecret = apiKeyCreds.secret?.let { cryptoUtils.encrypt(it) }
             val encryptedApiPassphrase = apiKeyCreds.passphrase?.let { cryptoUtils.encrypt(it) }
 
-            // 8. 创建账户
+            // 8. 生成账户名称（如果未提供，使用钱包地址后四位）
+            val accountName = if (request.accountName.isNullOrBlank()) {
+                val walletAddress = request.walletAddress.trim()
+                // 取地址后四位（去掉 0x 前缀后取后四位）
+                val addressWithoutPrefix = if (walletAddress.startsWith("0x") || walletAddress.startsWith("0X")) {
+                    walletAddress.substring(2)
+                } else {
+                    walletAddress
+                }
+                if (addressWithoutPrefix.length >= 4) {
+                    addressWithoutPrefix.substring(addressWithoutPrefix.length - 4).uppercase()
+                } else {
+                    addressWithoutPrefix.uppercase()
+                }
+            } else {
+                request.accountName.trim()
+            }
+
+            // 9. 创建账户
             val account = Account(
                 privateKey = encryptedPrivateKey,  // 存储加密后的私钥
                 walletAddress = request.walletAddress,
@@ -119,7 +137,7 @@ class AccountService(
                 apiKey = apiKeyCreds.apiKey,
                 apiSecret = encryptedApiSecret,  // 存储加密后的 API Secret
                 apiPassphrase = encryptedApiPassphrase,  // 存储加密后的 API Passphrase
-                accountName = request.accountName,
+                accountName = accountName,
                 isDefault = false,  // 不再支持默认账户
                 isEnabled = request.isEnabled,
                 createdAt = System.currentTimeMillis(),

backend/src/main/kotlin/com/wrbug/polymarketbot/service/TelegramNotificationService.kt

@@ -479,20 +479,18 @@ class TelegramNotificationService(
             ""
         }
 
-        return """
-            ✅ <b>$orderCreatedSuccess</b>
-            
-            📊 <b>$orderInfo：</b>
-            • $orderIdLabel: <code>${orderId ?: unknown}</code>
-            • $marketLabel: $marketDisplay$outcomeDisplay
-            • $sideLabel: <b>$sideDisplay</b>
-            • $priceLabel: <code>$price</code>
-            • $quantityLabel: <code>$size</code> shares
-            • $amountLabel: <code>$amountDisplay</code> USDC
-            • $accountLabel: $escapedAccountInfo
-            
-            ⏰ $timeLabel: <code>$time</code>
-        """.trimIndent()
+        return """✅ <b>$orderCreatedSuccess</b>
+
+📊 <b>$orderInfo：</b>
+• $orderIdLabel: <code>${orderId ?: unknown}</code>
+• $marketLabel: $marketDisplay$outcomeDisplay
+• $sideLabel: <b>$sideDisplay</b>
+• $priceLabel: <code>$price</code>
+• $quantityLabel: <code>$size</code> shares
+• $amountLabel: <code>$amountDisplay</code> USDC
+• $accountLabel: $escapedAccountInfo
+
+⏰ $timeLabel: <code>$time</code>"""
     }
 
     /**
@@ -605,22 +603,20 @@ class TelegramNotificationService(
             ""
         }
 
-        return """
-            ❌ <b>$orderCreatedFailed</b>
-            
-            📊 <b>$orderInfo：</b>
-            • $marketLabel: $marketDisplay$outcomeDisplay
-            • $sideLabel: <b>$sideDisplay</b>
-            • $priceLabel: <code>$price</code>
-            • $quantityLabel: <code>$size</code> shares
-            • $amountLabel: <code>$amountDisplay</code> USDC
-            • $accountLabel: $escapedAccountInfo
-            
-            ⚠️ <b>$errorInfo：</b>
-            <code>$escapedErrorMessage</code>
-            
-            ⏰ $timeLabel: <code>$time</code>
-        """.trimIndent()
+        return """❌ <b>$orderCreatedFailed</b>
+
+📊 <b>$orderInfo：</b>
+• $marketLabel: $marketDisplay$outcomeDisplay
+• $sideLabel: <b>$sideDisplay</b>
+• $priceLabel: <code>$price</code>
+• $quantityLabel: <code>$size</code> shares
+• $amountLabel: <code>$amountDisplay</code> USDC
+• $accountLabel: $escapedAccountInfo
+
+⚠️ <b>$errorInfo：</b>
+<code>$escapedErrorMessage</code>
+
+⏰ $timeLabel: <code>$time</code>"""
     }
 
     /**