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>

backend/routers/config.py

@@ -119,3 +119,31 @@ def save_options_gate(req: OptionsGateRequest):
     if req.iv_gate_skew_threshold is not None:
         set_config("iv_gate_skew_threshold", str(req.iv_gate_skew_threshold))
     return {"status": "ok"}
+
+
+# ── Tech Indicators config ──────────────────────────────────────────────────
+
+class TechIndicatorsRequest(BaseModel):
+    tech_indicators_enabled: Optional[bool] = None
+    tech_indicators_list: Optional[str] = None   # comma-separated: "rsi,ma,bollinger,atr"
+    tech_indicators_auto_calibrate: Optional[bool] = None
+
+
+@router.get("/tech-indicators")
+def get_tech_indicators():
+    return {
+        "tech_indicators_enabled": (get_config("tech_indicators_enabled") or "true").lower() == "true",
+        "tech_indicators_list": get_config("tech_indicators_list") or "rsi,ma,bollinger,atr",
+        "tech_indicators_auto_calibrate": (get_config("tech_indicators_auto_calibrate") or "true").lower() == "true",
+    }
+
+
+@router.put("/tech-indicators")
+def save_tech_indicators(req: TechIndicatorsRequest):
+    if req.tech_indicators_enabled is not None:
+        set_config("tech_indicators_enabled", "true" if req.tech_indicators_enabled else "false")
+    if req.tech_indicators_list is not None:
+        set_config("tech_indicators_list", req.tech_indicators_list)
+    if req.tech_indicators_auto_calibrate is not None:
+        set_config("tech_indicators_auto_calibrate", "true" if req.tech_indicators_auto_calibrate else "false")
+    return {"status": "ok"}