Initial efcore migration and updates to make sure upserting novels (mostly) works. still need to do chapter handling

WebNovelPortalAPI/appsettings.json

@@ -6,7 +6,7 @@
     }
   },
   "ConnectionStrings": {
-    "DefaultConnection": "null"
+    "DefaultConnection": "Data Source=/home/m/Documents/WebNovelPortal/WebNovelPortalAPI/test_db"
   },
   "AllowedHosts": "*"
 }