Add activation thresholds: qualified-signal defaults and views

Admin-configurable thresholds (min R:R, default 2.0; min confidence,
default 70%) defining what counts as an actionable signal:

- Admin Settings: new Activation Thresholds panel
  (GET/PUT /admin/settings/activation)
- GET /trades/activation exposes values to all users with access
- Signals/Setups: filters initialize from activation values
- Track Record: "Qualified signals only" toggle (default on) via
  min_rr/min_confidence params on /trades/performance; the
  confidence breakdown always covers the full population so the
  thresholds can be validated against outcomes
- Dashboard: "Qualified" metric and qualified-first Top Setups
- Outcome evaluator unchanged: every setup is still evaluated

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/pages/DashboardPage.tsx

@@ -1,5 +1,6 @@
 import { useMemo } from 'react';
 import { Link } from 'react-router-dom';
+import { useActivation } from '../hooks/useActivation';
 import { useTrades } from '../hooks/useTrades';
 import { useWatchlist } from '../hooks/useWatchlist';
 import { usePerformance } from '../hooks/usePerformance';
@@ -51,16 +52,25 @@ function DirectionTag({ direction }: { direction: string }) {
 export default function DashboardPage() {
   const trades = useTrades();
   const watchlist = useWatchlist();
+  const activation = useActivation();
   const performance = usePerformance();
 
-  const topSetups: TradeSetup[] = useMemo(
-    () => (trades.data ?? []).slice(0, 5),
-    [trades.data],
+  const minRR = activation.data?.min_rr ?? 2;
+  const minConfidence = activation.data?.min_confidence ?? 70;
+
+  const qualifiedSetups = useMemo(
+    () =>
+      (trades.data ?? []).filter(
+        (t) => t.rr_ratio >= minRR && (t.confidence_score ?? 0) >= minConfidence,
+      ),
+    [trades.data, minRR, minConfidence],
   );
 
-  const highConfidenceCount = useMemo(
-    () => (trades.data ?? []).filter((t) => (t.confidence_score ?? 0) >= 70).length,
-    [trades.data],
+  // Show qualified setups first; fall back to the full list when none qualify
+  const showingQualified = qualifiedSetups.length > 0;
+  const topSetups: TradeSetup[] = useMemo(
+    () => (showingQualified ? qualifiedSetups : trades.data ?? []).slice(0, 5),
+    [showingQualified, qualifiedSetups, trades.data],
   );
 
   const topWatchlist = useMemo(
@@ -100,10 +110,10 @@ export default function DashboardPage() {
             sub="latest per ticker & direction"
           />
           <Metric
-            label="High Confidence"
-            value={String(highConfidenceCount)}
-            sub="confidence ≥ 70%"
-            valueClass={highConfidenceCount > 0 ? 'text-blue-300' : 'text-gray-100'}
+            label="Qualified"
+            value={String(qualifiedSetups.length)}
+            sub={`R:R ≥ ${minRR.toFixed(1)} & conf ≥ ${minConfidence.toFixed(0)}%`}
+            valueClass={qualifiedSetups.length > 0 ? 'text-blue-300' : 'text-gray-100'}
           />
           <Metric
             label="Hit Rate"
@@ -122,7 +132,7 @@ export default function DashboardPage() {
       <div className="grid gap-8 xl:grid-cols-5">
         {/* Top setups */}
         <div className="xl:col-span-3">
-          <Section title="Top Setups" hint="by confidence">
+          <Section title="Top Setups" hint={showingQualified ? 'qualified, by confidence' : 'none qualified — showing all'}>
             {trades.isLoading && <SkeletonTable rows={5} cols={5} />}
             {trades.isError && <Callout variant="error">Failed to load setups</Callout>}
             {trades.data && topSetups.length === 0 && (