Default delete & dataset creation fix

[JSabadin]

Purpose

• Raise an error if neither delete_remote nor delete_local is specified when calling LuxonisDataset.delete_dataset().
• Prevent unintended dataset creation when inspecting a non-existent dataset.
• Fix export paths so they use POSIX-style single slashes.

Specification

None / not applicable

Dependencies & Potential Impact

None / not applicable

Deployment Plan

None / not applicable

Testing & Validation

None / not applicable

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.58%. Comparing base (6ab5a8d) to head (26e9a7e).
Report is 3 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #341   +/-   ##
=======================================
  Coverage   95.58%   95.58%           
=======================================
  Files         102      102           
  Lines        6118     6122    +4     
=======================================
+ Hits         5848     5852    +4     
  Misses        270      270           

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