fix: wrap entire SD handler in try-except to prevent crashes when SD is unreachable

service_desk/handlers.py

@@ -394,6 +394,13 @@ async def sd_module_handler(msg: Message):
             elif msg_text.strip():
                 await msg.answer(UNKNOWN_MAIN_CMD_TEXT, parse_mode="html")
             return
+    except Exception as e:
+        logger.exception(f"❌ [SD Fatal Error] user={getattr(msg.from_user, 'id', 'unknown')}: {e}")
+        sd_workflow_logger.error(f"❌ [SD Fatal] {e}")
+        try:
+            await msg.answer(system_error_text(EMOJI_DIGITS), parse_mode="html")
+        except Exception:
+            pass