fix: Correct order filtering to prevent false '32 orders' count

Problem: Bot reported '32 open orders' when Drift UI showed 0 orders
Root Cause: Filter checked orderId > 0 but didn't verify baseAssetAmount
Impact: Misleading logs suggesting ghost order accumulation

Fix: Enhanced filter with proper empty slot detection:
- Check orderId exists and is non-zero
- Check baseAssetAmount exists and is non-zero (BN comparison)
- Added logging to show: 'Found X orders (checked 32 total slots)'

Result: Bot now correctly reports 0 orders when none exist
Verification: Container restart shows no false positives

Files: lib/drift/orders.ts (cancelAllOrders function)

lib/drift/orders.ts

@@ -807,12 +807,23 @@ export async function cancelAllOrders(
       throw new Error('User account not found')
     }
     
-    // Filter orders for this market (check for active orders, not just status)
-    // Note: Trigger orders may have different status values, so we check for non-zero orderId
+    // Filter orders for this market (check for TRULY active orders)
+    // CRITICAL: Empty slots have orderId=0 OR baseAssetAmount=0
+    // Only count orders that actually exist and are open
     const ordersToCancel = userAccount.orders.filter(
-      (order: any) => 
-        order.marketIndex === marketConfig.driftMarketIndex &&
-        order.orderId > 0 // Active orders have orderId > 0
+      (order: any) => {
+        // Skip if not our market
+        if (order.marketIndex !== marketConfig.driftMarketIndex) return false
+        
+        // Skip if orderId is 0 (empty slot)
+        if (!order.orderId || order.orderId === 0) return false
+        
+        // Skip if baseAssetAmount is 0 (no actual order size)
+        if (!order.baseAssetAmount || order.baseAssetAmount.eq(new BN(0))) return false
+        
+        // This is a real active order
+        return true
+      }
     )
 
     if (ordersToCancel.length === 0) {
@@ -821,6 +832,7 @@ export async function cancelAllOrders(
     }
 
     console.log(`📋 Found ${ordersToCancel.length} open orders to cancel (including trigger orders)`)
+    console.log(`   (checked ${userAccount.orders.length} total order slots)`)
     
     // Cancel all orders with retry logic for rate limits
     const txSig = await retryWithBackoff(async () => {