feat: add ALT gate-control card to signals-v53 and paper-v53 latest signals

frontend/app/paper-v53/page.tsx

@@ -104,6 +104,12 @@ function LatestSignals({ strategy }: { strategy: StrategyTab }) {
               </div>
               {fc && strategy === "v53_alt" && (
                 <div className="flex gap-1 mt-1 flex-wrap">
+                  <span className={`text-[9px] px-1 py-0.5 rounded ${(fc.gate_passed ?? true) ? "bg-emerald-100 text-emerald-700" : "bg-red-100 text-red-600"}`}>
+                    {(fc.gate_passed ?? true) ? "✅ Gate通过" : "❌ 否决"}
+                  </span>
+                  {fc.gate_block && (
+                    <span className="text-[9px] px-1 py-0.5 rounded bg-orange-50 text-orange-700">{fc.gate_block}</span>
+                  )}
                   <span className="text-[9px] px-1 py-0.5 rounded bg-blue-50 text-blue-700">方向{fc.direction?.score ?? 0}/55</span>
                   <span className="text-[9px] px-1 py-0.5 rounded bg-violet-50 text-violet-700">拥挤{fc.crowding?.score ?? 0}/25</span>
                   <span className="text-[9px] px-1 py-0.5 rounded bg-emerald-50 text-emerald-700">环境{fc.environment?.score ?? 0}/15</span>

frontend/app/signals-v53/page.tsx

@@ -46,7 +46,8 @@ interface LatestIndicator {
     auxiliary?: { score?: number; max?: number; coinbase_premium?: number };
     // BTC gate fields
     gate_passed?: boolean;
-    block_reason?: string;
+    block_reason?: string;     // BTC用
+    gate_block?: string;       // ALT用
     obi_raw?: number;
     spot_perp_div?: number;
     whale_cvd_ratio?: number;
@@ -91,6 +92,62 @@ function LayerScore({ label, score, max, colorClass }: { label: string; score: n
   );
 }
 
+// ─── ALT Gate 状态卡片 ──────────────────────────────────────────
+
+const ALT_GATE_THRESHOLDS: Record<string, { vol: string; obi: string; spd: string; whale: string }> = {
+  ETH: { vol: "0.3%", obi: "0.35", spd: "0.5%", whale: "$50k" },
+  XRP: { vol: "0.4%", obi: "0.40", spd: "0.6%", whale: "$30k" },
+  SOL: { vol: "0.6%", obi: "0.45", spd: "0.8%", whale: "$20k" },
+};
+
+function ALTGateCard({ symbol, factors }: { symbol: Symbol; factors: LatestIndicator["factors"] }) {
+  if (!factors || symbol === "BTC") return null;
+  const thresholds = ALT_GATE_THRESHOLDS[symbol] ?? ALT_GATE_THRESHOLDS["ETH"];
+  const passed = factors.gate_passed ?? true;
+  const blockReason = factors.gate_block;
+  return (
+    <div className={`rounded-xl border px-3 py-2 mt-2 ${passed ? "border-purple-200 bg-purple-50" : "border-red-200 bg-red-50"}`}>
+      <div className="flex items-center justify-between mb-1.5">
+        <p className="text-[10px] font-semibold text-purple-800">🔒 {symbol} Gate-Control</p>
+        <span className={`text-[10px] font-bold px-2 py-0.5 rounded ${passed ? "bg-emerald-100 text-emerald-700" : "bg-red-100 text-red-600"}`}>
+          {passed ? "✅ Gate通过" : "❌ 否决"}
+        </span>
+      </div>
+      <div className="grid grid-cols-4 gap-1.5">
+        <div className="bg-white rounded px-2 py-1">
+          <p className="text-[10px] text-slate-400">波动率</p>
+          <p className="text-xs font-mono text-slate-800">{((factors.atr_pct_price ?? 0) * 100).toFixed(3)}%</p>
+          <p className="text-[9px] text-slate-400">需 ≥{thresholds.vol}</p>
+        </div>
+        <div className="bg-white rounded px-2 py-1">
+          <p className="text-[10px] text-slate-400">OBI</p>
+          <p className={`text-xs font-mono ${(factors.obi_raw ?? 0) >= 0 ? "text-emerald-600" : "text-red-500"}`}>
+            {((factors.obi_raw ?? 0) * 100).toFixed(2)}%
+          </p>
+          <p className="text-[9px] text-slate-400">否决±{thresholds.obi}</p>
+        </div>
+        <div className="bg-white rounded px-2 py-1">
+          <p className="text-[10px] text-slate-400">期现背离</p>
+          <p className={`text-xs font-mono ${(factors.spot_perp_div ?? 0) >= 0 ? "text-emerald-600" : "text-red-500"}`}>
+            {((factors.spot_perp_div ?? 0) * 10000).toFixed(2)}bps
+          </p>
+          <p className="text-[9px] text-slate-400">否决±{thresholds.spd}</p>
+        </div>
+        <div className="bg-white rounded px-2 py-1">
+          <p className="text-[10px] text-slate-400">鲸鱼阈值</p>
+          <p className="text-xs font-mono text-slate-800">{thresholds.whale}</p>
+          <p className="text-[9px] text-slate-400">大单门槛</p>
+        </div>
+      </div>
+      {blockReason && (
+        <p className="text-[10px] text-red-600 mt-1.5 bg-red-50 rounded px-2 py-1">
+          否决原因: <span className="font-mono">{blockReason}</span>
+        </p>
+      )}
+    </div>
+  );
+}
+
 // ─── BTC Gate 状态卡片 ───────────────────────────────────────────
 
 function BTCGateCard({ factors }: { factors: LatestIndicator["factors"] }) {
@@ -266,6 +323,9 @@ function IndicatorCards({ symbol }: { symbol: Symbol }) {
         )}
       </div>
 
+      {/* ALT Gate 卡片 */}
+      {!isBTC && data.factors && <ALTGateCard symbol={symbol} factors={data.factors} />}
+
       {/* BTC Gate 卡片 */}
       {isBTC && data.factors && <BTCGateCard factors={data.factors} />}
     </div>