[DOC] Add DLinear v2 tutorial notebook

[richardmilles]

Reference Issues/PRs

Fixes #2390.

What does this implement/fix? Explain your changes.

Adds a DLinear v2 tutorial using TimeSeries + TslibDataModule via DLinear_pkg_v2 (with scalers) and links it from tutorials_v2.rst.

Did you add any tests for the change?

No — documentation-only change.

PR checklist

• The PR title starts with either [ENH], [MNT], [DOC], or [BUG].
• Added/modified tests
• Used pre-commit hooks when committing to ensure that code is compliant with hooks.

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✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2392   +/-   ##
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  Coverage        ?   88.12%           
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  Files           ?      196           
  Lines           ?    11051           
  Branches        ?        0           
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  Hits            ?     9739           
  Misses          ?     1312           
  Partials        ?        0           

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pytest	88.12% <ø> (?)

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