Skip object store folder creation when no storage access

[Martin-Molinero]

Description

LocalObjectStore.Initialize created the storage root directory unconditionally, and did so before Controls were even assigned. On environments where the process lacks permission to the target path (e.g. a read-only /Storage mount), this threw an UnauthorizedAccessException during engine startup even for jobs that have no storage access at all:

System.UnauthorizedAccessException: Access to the path '/Storage' is denied.
 ---> System.IO.IOException: Permission denied
   at System.IO.Directory.CreateDirectory(String path)
   at QuantConnect.Lean.Engine.Storage.LocalObjectStore.Initialize(...)

Changes

• Assign Controls and _algorithmMode before resolving the storage root.
• Only create the root directory when StorageAccess is null (backwards-compatible default) or grants at least one of read/write/delete. This matches the permission checks that already guard every disk-touching operation (ContainsKey/ReadBytes/SaveBytes/Delete/enumeration), so when all permissions are false nothing ever reaches the folder.
• When access is fully denied, AlgorithmStorageRoot is still normalized via Path.GetFullPath (no filesystem write) so later path comparisons remain consistent with the FullName-normalized form used elsewhere.

Related Issue

N/A