🎨 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>

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",