Init first files

backend/app/core/logging.py

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+import json
+import logging
+from datetime import datetime, timezone
+
+
+class JsonFormatter(logging.Formatter):
+    def format(self, record: logging.LogRecord) -> str:
+        payload = {
+            "ts": datetime.now(timezone.utc).isoformat(),
+            "level": record.levelname,
+            "logger": record.name,
+            "msg": record.getMessage(),
+        }
+        if record.exc_info:
+            payload["exc_info"] = self.formatException(record.exc_info)
+        return json.dumps(payload, ensure_ascii=True)
+
+
+def configure_logging(level: str) -> None:
+    handler = logging.StreamHandler()
+    handler.setFormatter(JsonFormatter())
+    logging.basicConfig(level=level, handlers=[handler], force=True)