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/components/signals/SetupsPanel.tsx

@@ -1,5 +1,6 @@
 import { useMemo, useState } from 'react';
 import { useMutation, useQueryClient } from '@tanstack/react-query';
+import { useActivation } from '../../hooks/useActivation';
 import { useTrades } from '../../hooks/useTrades';
 import { TradeTable, type SortColumn, type SortDirection, computeTradeAnalysis } from '../scanner/TradeTable';
 import { SkeletonTable } from '../ui/Skeleton';
@@ -94,16 +95,22 @@ function sortTrades(
 
 export function SetupsPanel() {
   const { data: trades, isLoading, isError, error } = useTrades();
+  const activation = useActivation();
   const queryClient = useQueryClient();
   const toast = useToast();
 
-  const [minRR, setMinRR] = useState(0);
+  // null = user hasn't touched the filter; falls back to admin-configured
+  // activation thresholds once loaded
+  const [minRROverride, setMinRROverride] = useState<number | null>(null);
+  const [minConfidenceOverride, setMinConfidenceOverride] = useState<number | null>(null);
   const [directionFilter, setDirectionFilter] = useState<DirectionFilter>('both');
-  const [minConfidence, setMinConfidence] = useState(0);
   const [actionFilter, setActionFilter] = useState<ActionFilter>('all');
   const [sortColumn, setSortColumn] = useState<SortColumn>('rr_ratio');
   const [sortDirection, setSortDirection] = useState<SortDirection>('desc');
 
+  const minRR = minRROverride ?? activation.data?.min_rr ?? 0;
+  const minConfidence = minConfidenceOverride ?? activation.data?.min_confidence ?? 0;
+
   const scanMutation = useMutation({
     mutationFn: () => triggerJob('rr_scanner'),
     onSuccess: () => {
@@ -143,7 +150,7 @@ export function SetupsPanel() {
               min={0}
               step={0.1}
               value={minRR}
-              onChange={(e) => setMinRR(Number(e.target.value) || 0)}
+              onChange={(e) => setMinRROverride(Number(e.target.value) || 0)}
               className="w-20"
             />
           </div>
@@ -167,7 +174,7 @@ export function SetupsPanel() {
             max={100}
             step={1}
             value={minConfidence}
-            onChange={(e) => setMinConfidence(Number(e.target.value) || 0)}
+            onChange={(e) => setMinConfidenceOverride(Number(e.target.value) || 0)}
             className="w-24"
           />
         </Field>