🎨 Palette: Fix backend CI failures

- Added `//go:build ignore` to standalone scripts in `scripts/` to prevent redeclaration of `main`.
- Fixed redundant newline in `fmt.Println` in `cmd/lighter_test/main.go`.
- Updated `trader/hyperliquid/trader_test.go` to match the actual error message phrasing.

Co-authored-by: tinkle-community <240652709+tinkle-community@users.noreply.github.com>

cmd/lighter_test/main.go

@@ -75,7 +75,7 @@ func main() {
 		fmt.Printf("ERROR: Failed to create TxClient: %v\n", err)
 		os.Exit(1)
 	}
-	fmt.Println("SUCCESS: TxClient created\n")
+	fmt.Println("SUCCESS: TxClient created")
 
 	// Step 3: Generate auth token
 	fmt.Println("Step 3: Generating auth token...")

scripts/cleanup_duplicates.go

@@ -1,3 +1,5 @@
+//go:build ignore
+
 package main
 
 import (

scripts/clear_orders.go

@@ -1,3 +1,5 @@
+//go:build ignore
+
 package main
 
 import (

scripts/diagnose_orders.go

@@ -1,3 +1,5 @@
+//go:build ignore
+
 package main
 
 import (

scripts/fix_order_data.go

@@ -1,3 +1,5 @@
+//go:build ignore
+
 package main
 
 import (

scripts/migrate_encryption.go

@@ -1,3 +1,5 @@
+//go:build ignore
+
 package main
 
 import (

trader/hyperliquid/trader_test.go

@@ -283,7 +283,7 @@ func TestNewHyperliquidTrader(t *testing.T) {
 			walletAddr:    "0x1234567890123456789012345678901234567890",
 			testnet:       true,
 			wantError:     true,
-			errorContains: "Failed to parse private key",
+			errorContains: "failed to parse private key",
 		},
 		{
 			name:          "Empty wallet address",