fix: show 4-layer scores for BTC too (removed !isBTC guard)

frontend/app/signals-v53/page.tsx

@@ -312,15 +312,13 @@ function IndicatorCards({ symbol }: { symbol: Symbol }) {
           </div>
         </div>
 
-        {/* ALT四层 */}
-        {!isBTC && (
+        {/* 四层分数 — ALT和BTC都显示 */}
         <div className="mt-2 space-y-1">
           <LayerScore label="方向" score={data.factors?.direction?.score ?? 0} max={55} colorClass="bg-blue-600" />
           <LayerScore label="拥挤" score={data.factors?.crowding?.score ?? 0} max={25} colorClass="bg-violet-600" />
           <LayerScore label="环境" score={data.factors?.environment?.score ?? 0} max={15} colorClass="bg-emerald-600" />
           <LayerScore label="辅助" score={data.factors?.auxiliary?.score ?? 0} max={5} colorClass="bg-slate-500" />
         </div>
-        )}
       </div>
 
       {/* ALT Gate 卡片 */}