fix: CI security — bandit B112 sur search_shared_notes (nosec, continue délibéré)

backend/services/search.py

@@ -80,7 +80,7 @@ def _shared_results(username: str, q: str, vault: str) -> list[dict[str, Any]]:
             if not fp.exists() or fp.suffix.lower() != ".md":
                 continue
             raw = fp.read_text(encoding="utf-8", errors="replace")
-        except Exception:
+        except Exception:  # nosec B112 — partage illisible : ignoré, on continue
             continue
         title = fp.stem
         occurrences = raw.lower().count(q_lower)