feat(hyperliquid): add stock symbol market data support

- Add Hyperliquid/XYZ symbol normalization tests and backend coverage

- Extend kline and market data lookup paths for US stock symbols

- Wire frontend data API types for stock-oriented market requests

market/data_hyperliquid_xyz_test.go

@@ -0,0 +1,26 @@
+package market
+
+import "testing"
+
+func TestHyperliquidXYZAliasesNormalizeForAIDecisionData(t *testing.T) {
+	tests := []struct {
+		input      string
+		normalized string
+		isXyzAsset bool
+	}{
+		{input: "SMSN-USDC", normalized: "xyz:SMSN", isXyzAsset: true},
+		{input: "SAMSUNG-USDC", normalized: "xyz:SMSN", isXyzAsset: true},
+		{input: "xyz:SMSN", normalized: "xyz:SMSN", isXyzAsset: true},
+		{input: "TESLA-USDC", normalized: "xyz:TSLA", isXyzAsset: true},
+		{input: "TSLA-USDC", normalized: "xyz:TSLA", isXyzAsset: true},
+	}
+
+	for _, tt := range tests {
+		if got := Normalize(tt.input); got != tt.normalized {
+			t.Fatalf("Normalize(%q) = %q, want %q", tt.input, got, tt.normalized)
+		}
+		if got := IsXyzDexAsset(tt.normalized); got != tt.isXyzAsset {
+			t.Fatalf("IsXyzDexAsset(%q) = %v, want %v", tt.normalized, got, tt.isXyzAsset)
+		}
+	}
+}