fix: make dev_mode configurable via INSAITS_DEV_MODE env var

Defaults to true (no API key needed) but can be disabled by setting
INSAITS_DEV_MODE=false for production deployments with an API key.

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

scripts/hooks/insaits-security-monitor.py

@@ -175,7 +175,7 @@ def main() -> None:
 
     monitor: insAItsMonitor = insAItsMonitor(
         session_name="claude-code-hook",
-        dev_mode=True,
+        dev_mode=os.environ.get("INSAITS_DEV_MODE", "true").lower() in ("1", "true", "yes"),
     )
     result: Dict[str, Any] = monitor.send_message(
         text=text[:4000],