feat: Add automated profit withdrawal system

- UI page: /withdrawals with stats dashboard and config form
- Settings API: GET/POST for .env configuration
- Stats API: Real-time profit and withdrawal calculations
- Execute API: Safe withdrawal with Drift SDK integration
- Drift service: withdrawFromDrift() with USDC spot market (index 0)
- Safety checks: Min withdrawal amount, min account balance, profit-only
- Telegram notifications: Withdrawal alerts with Solscan links
- Dashboard navigation: Added Withdrawals card (3-card grid)

User goal: 10% of profits automatically withdrawn on schedule
Current: Manual trigger ready, scheduled automation pending
Files: 5 new (withdrawals page, 3 APIs, Drift service), 2 modified

lib/notifications/telegram.ts

@@ -17,6 +17,16 @@ interface TelegramNotificationOptions {
   maxGain?: number
 }
 
+interface TelegramWithdrawalOptions {
+  type: 'withdrawal'
+  amount: number
+  signature: string
+  availableProfit: number
+  totalWithdrawn: number
+}
+
+type TelegramOptions = TelegramNotificationOptions | TelegramWithdrawalOptions
+
 /**
  * Send Telegram notification for position closure
  */
@@ -107,3 +117,59 @@ function formatHoldTime(seconds: number): string {
     return `${secs}s`
   }
 }
+
+/**
+ * Send Telegram notification (supports both position closures and withdrawals)
+ */
+export async function sendTelegramNotification(options: TelegramOptions): Promise<void> {
+  if ('type' in options && options.type === 'withdrawal') {
+    return sendWithdrawalNotification(options)
+  }
+  return sendPositionClosedNotification(options as TelegramNotificationOptions)
+}
+
+/**
+ * Send withdrawal notification
+ */
+async function sendWithdrawalNotification(options: TelegramWithdrawalOptions): Promise<void> {
+  try {
+    const token = process.env.TELEGRAM_BOT_TOKEN
+    const chatId = process.env.TELEGRAM_CHAT_ID
+
+    if (!token || !chatId) {
+      console.log('⚠️ Telegram credentials not configured, skipping notification')
+      return
+    }
+
+    const message = `💸 PROFIT WITHDRAWAL
+
+💰 Amount: $${options.amount.toFixed(2)} USDC
+
+📊 Available Profit: $${options.availableProfit.toFixed(2)}
+📈 Total Withdrawn: $${options.totalWithdrawn.toFixed(2)}
+
+🔗 Transaction: <a href="https://solscan.io/tx/${options.signature}">${options.signature.substring(0, 8)}...</a>
+
+✅ Funds sent to your wallet`
+
+    const url = `https://api.telegram.org/bot${token}/sendMessage`
+    const response = await fetch(url, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({
+        chat_id: chatId,
+        text: message,
+        parse_mode: 'HTML'
+      })
+    })
+
+    if (!response.ok) {
+      const errorData = await response.json()
+      console.error('❌ Telegram notification failed:', errorData)
+    } else {
+      console.log('✅ Telegram withdrawal notification sent')
+    }
+  } catch (error) {
+    console.error('❌ Error sending Telegram notification:', error)
+  }
+}