feat: Phase 3 — indicateurs techniques calibrés par horizon option

- technical_indicators.py (nouveau) : compute_indicators() calcule RSI, MA fast/slow,
  Bollinger Bands, ATR — périodes calibrées automatiquement selon horizon_days
- config.py : endpoints GET/PUT /config/tech-indicators (activé, liste, auto-calibration)
- useApi.ts : useTechIndicatorsConfig + useSaveTechIndicatorsConfig hooks
- Config.tsx : carte "Indicateurs techniques" dans Options—Paramètres avec toggles
- auto_cycle.py : compute top-5 tickers à chaque cycle si tech_indicators_enabled=true
- ai_analyzer.py : tech_indicators_block injecté dans suggestion + scoring prompts

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/hooks/useApi.ts

@@ -491,6 +491,25 @@ export const useSaveOptionsGate = () => {
   })
 }
 
+export const useTechIndicatorsConfig = () =>
+  useQuery({
+    queryKey: ['tech-indicators-config'],
+    queryFn: () => api.get('/config/tech-indicators').then(r => r.data),
+    staleTime: 60_000,
+  })
+
+export const useSaveTechIndicatorsConfig = () => {
+  const qc = useQueryClient()
+  return useMutation({
+    mutationFn: (body: {
+      tech_indicators_enabled?: boolean
+      tech_indicators_list?: string
+      tech_indicators_auto_calibrate?: boolean
+    }) => api.put('/config/tech-indicators', body).then(r => r.data),
+    onSuccess: () => qc.invalidateQueries({ queryKey: ['tech-indicators-config'] }),
+  })
+}
+
 export const useSimPortfolioRisk = () =>
   useQuery({
     queryKey: ['journal-portfolio-risk'],