Keep API not-found and 401 responses usable behind Ingress and in the Web UI.

Return native JSON with the missing id in the message, clear stale sessions on
401, and document ingress-nginx annotations so branded HTML 404/405 pages do
not rewrite simulator bodies.

app/vsphere/rest/platform_rest.py

@@ -464,9 +464,7 @@ async def host_storage(
     database: Database = Depends(get_database),
     _: SessionInfo = Depends(require_read),
 ) -> list[dict[str, Any]]:
-    obj = await inventory.get_object(database, host)
-    if obj is None or obj.type != "HostSystem":
-        raise not_found(f"Host {host} not found")
+    obj = await inventory.require_object(database, host, type_name="HostSystem", resource="host")
     devices = obj.props.get("storage_devices")
     return list(devices) if isinstance(devices, list) else []
 
@@ -477,9 +475,7 @@ async def host_networking(
     database: Database = Depends(get_database),
     _: SessionInfo = Depends(require_read),
 ) -> dict[str, Any]:
-    obj = await inventory.get_object(database, host)
-    if obj is None or obj.type != "HostSystem":
-        raise not_found(f"Host {host} not found")
+    obj = await inventory.require_object(database, host, type_name="HostSystem", resource="host")
     networking = obj.props.get("networking")
     return networking if isinstance(networking, dict) else {}
 
@@ -490,9 +486,7 @@ async def folder_children(
     database: Database = Depends(get_database),
     _: SessionInfo = Depends(require_read),
 ) -> list[dict[str, str]]:
-    parent = await inventory.get_object(database, folder)
-    if parent is None:
-        raise not_found(f"Folder {folder} not found")
+    await inventory.require_object(database, folder, resource="folder")
     children = [obj for obj in await inventory.list_objects(database) if obj.parent_moid == folder]
     return [{"moid": c.moid, "type": c.type, "name": c.name} for c in children]