feat: Rapport de Cycle — auto-généré à chaque run avec contexte IA, delta, PnL/VaR snapshot

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

backend/routers/reports.py

@@ -0,0 +1,25 @@
+from fastapi import APIRouter, HTTPException
+from services.database import get_cycle_reports, get_cycle_report, get_latest_cycle_report
+
+router = APIRouter(prefix="/api/reports", tags=["reports"])
+
+
+@router.get("/cycle/latest")
+def cycle_report_latest():
+    """Most recent generated cycle report."""
+    return {"report": get_latest_cycle_report()}
+
+
+@router.get("/cycle/list")
+def cycle_report_list(limit: int = 20):
+    """List of cycle report summaries (no full JSON)."""
+    return {"reports": get_cycle_reports(limit)}
+
+
+@router.get("/cycle/{run_id}")
+def cycle_report_detail(run_id: str):
+    """Full cycle report for a specific run_id."""
+    report = get_cycle_report(run_id)
+    if not report:
+        raise HTTPException(404, "Rapport de cycle introuvable")
+    return report