Add multi-factor conviction gate to activation

Make "qualified" mean an edge candidate, not just R:R + confidence.
The gate now also requires (all admin-configurable, defaults on):
- high conviction: recommended_action LONG_HIGH / SHORT_HIGH only
- clean read: risk_level Low (no contradicting signals)
- probable primary target: best target probability >= min (default 60)

- Shared predicate: app/services/qualification.py +
  frontend/src/lib/qualification.ts (mirrored)
- Activation config extended (min_target_probability,
  require_high_conviction, exclude_conflicts) with bool-aware
  get/update + validation
- /trades/performance switched to ?qualified_only=true, applying
  the full gate server-side; confidence breakdown stays unfiltered
- Dashboard "Qualified", Signals "Qualified only" toggle, and
  Track Record all use the one gate; Admin gains the new controls

Sentiment provider runtime config (prior change) included.

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

frontend/src/components/signals/TrackRecordPanel.tsx

@@ -1,6 +1,7 @@
 import { useState } from 'react';
 import { useMutation, useQueryClient } from '@tanstack/react-query';
 import { useActivation } from '../../hooks/useActivation';
+import { activationSummary } from '../../lib/qualification';
 import { usePerformance } from '../../hooks/usePerformance';
 import { triggerJob } from '../../api/admin';
 import { Button } from '../ui/Button';
@@ -94,11 +95,9 @@ export function TrackRecordPanel() {
   const [qualifiedOnly, setQualifiedOnly] = useState(true);
   const activation = useActivation();
 
-  const params = qualifiedOnly && activation.data
-    ? { min_rr: activation.data.min_rr, min_confidence: activation.data.min_confidence }
-    : undefined;
-
-  const { data, isLoading, isError, error } = usePerformance(params);
+  const { data, isLoading, isError, error } = usePerformance(
+    qualifiedOnly ? { qualified_only: true } : undefined,
+  );
   const queryClient = useQueryClient();
   const toast = useToast();
 
@@ -126,9 +125,7 @@ export function TrackRecordPanel() {
           <span>
             Qualified signals only
             {activation.data && (
-              <span className="num ml-2 text-xs text-gray-500">
-                R:R ≥ {activation.data.min_rr.toFixed(1)} · conf ≥ {activation.data.min_confidence.toFixed(0)}%
-              </span>
+              <span className="num ml-2 text-xs text-gray-500">{activationSummary(activation.data)}</span>
             )}
           </span>
         </label>