Consume PocketBase for posts and events, with English routes

Elternbeirat.Web/appsettings.json

@@ -5,5 +5,10 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "PocketBase": {
+    // The PocketBase service name on the compose network. compose.yaml overrides
+    // this via the env var PocketBase__BaseUrl; local dev uses appsettings.Development.json.
+    "BaseUrl": "http://eb-pocketbase:8090"
+  }
 }