feat(logging): add structured JSON logging for production, human-readable text for development

backend/app/main.py

@@ -47,10 +47,9 @@ from app.jobs.mitre_sync_job import start_scheduler, scheduler
 _IS_PRODUCTION = os.environ.get("AEGIS_ENV", "").lower() == "production"
 
 # ── Logging ───────────────────────────────────────────────────────────────
-logging.basicConfig(
-    level=logging.INFO,
-    format="%(asctime)s  %(levelname)-8s  %(name)s — %(message)s",
-)
+from app.logging_config import setup_logging
+
+setup_logging()
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):